Early planning In late 1983, Party Secretary of Shenzhen Mayor Liang Xiang led a team to Singapore to study its mass transit system. Upon returning it was decided that on each side of Shennan Avenue should be protected as a green belt, and to set aside a wide median reserved for a light rail or
light metro line. In 1984, the "Shenzhen Special Economic Zone Master Plan (1985–2000)" pointed out that, with the growing population and traffic in Shenzhen, a light metro system would not have sufficient capacity to meet future demand. Instead the report proposed a heavy rail subway line to be built along Shennan Avenue. The project was finally approved by the Central Planning Department in 1992. In August 1992, during and re-feasibility and rail network planning, The Shenzhen Municipal Government decided to move from building a light metro line to a heavy rail subway line. The rapid growth of Shenzhen City made a lower capacity light metro line impractical. In 1994, Shenzhen organized the preparation of the "Shenzhen urban rail network master plan" to be incorporated into the "Shenzhen City Master Plan (1996–2010)". The city's vision for an urban rail network would consists of nine lines. Of the nine transit lines, three of them would be commuter rail lines upgraded from existing national mainline railways. The total length of the proposed network would be about . The three upgraded commuter rail lines would overlap the
Guangzhou–Shenzhen railway,
Pinghu–Nanshan railway and Pingyan railway.
Construction suspended and restarted In December 1995, the State Council issued the "moratorium on approval of urban rapid transit projects" to suspend approval of rail transit projects in all Chinese cities except Beijing, Shanghai, and Guangzhou. The Shenzhen Metro project was postponed. In 1996, prior to the handover of Hong Kong, authorities attempted to restart construction by renaming the project "The Luohu, Huanggang / Lok Ma Chau border crossing passenger rail connection project", stressing that the project is designed to meet the potential growing demand for cross-border passenger traffic after the handover. In July 1998, SZMC (Shenzhen Metro Group). was formally established.
Name changes On April 23, 2008, Shenzhen Municipal Planning Bureau announced that it would change the nomenclature of Shenzhen's subway lines according to the "2007 Urban Rail Transit Plan Scheme". Instead of using numbers as the lines official designation, as typically used in other mainland Chinese metro systems, lines would be given Chinese names more akin to the Hong Kong MTR. In 2010, the Scheme was reviewed and adjusted with new routes and names in addition to newly proposed lines. On October 23, 2013, the SZMC (Shenzhen Metro Group) decided that current operational lines will have their number and names combined, while future lines will only be numbered. Due to the change in the construction order of several lines, some numerical names have been reviewed in order to prevent big jump between numbers. By 2016, only numerical names are used. Lines currently in operation: Lines under construction:
Phase II (2007–2011) + 2025 From 2004 to 2007, there was a lack of official government interest and attention to expanding the subway after completion of Phase 1 with little or no active projects. Subway construction speed was ridiculed as "earthworm speed". On January 17, 2007, Shenzhen won the right to host the
2011 Universiade. In the bid Shenzhen committed to complete of subway lines before the games. Subsequently, the Shenzhen municipal government and various departments signed a liability form, requiring Phase II subway expansion to be completed in time for the Universiade. Shenzhen Metro increased to over a hundred operating metro stations in June 2011, just before the Shenzhen Universiade games. In the span of two weeks, the network expanded from to . This expansion increased rail transit's share of total public transit trips from 6% to 29% in 2014.
Phase III (2012–2023) In 2010, the Shenzhen Urban Planning and Land Resources Committee proposed a building program (Phase III) between 2011 and 2020. In 2011 this plan was approved by the
NDRC. Phase III formally commenced in May 2011 with an expected cost of 125.6 billion yuan. It will cover Lines 6, 7, 8, 9, and 11 and will extend the length of the Shenzhen Metro to and 10 lines. In June 2011, the Shenzhen Urban Planning and Land Resources Commission started gather public input on Phase III station names. On June 28, 2016, Line 11 opened being the first subway line in Shenzhen with 8 car trains and maximum service speed and the first in China with a First Class service. Lines 7 and 9 followed on October 28, 2016. South extension of Line 5 opened on September 28, 2019, and west extension of Line 9 opened on December 8, 2019. Line 6 and Line 10 opened on August 18, 2020, bringing the length of the Shenzhen Metro to and the fourth longest in China. Second east extension of Line 2, second south extension of Line 3, second north extension of Line 4 and phase 1 of Line 8 opened on October 28, 2020, bringing the length of the Shenzhen Metro to . Phase III is also the first phase in which the lines are officially numbered instead of named and colored.
Phase IV & Phase IV revised expansion (2017–2027) With the shortening of the Phase III implementation period, a number of lines (Lines 16 and 12) planned in 2007's Phase III moved into the next phase. By 2016, it was determined that Phase IV will have an implementation period between 2017 and 2022 and consist of of new subway. Lines 13 and 14 which originally had a long term 2030 completion deadline were moved into Phase IV expansion. In addition, a branch line of Line 6 will connect with the neighboring
Dongguan Rail Transit system. Lines 12, 13, 14, and 16 and branch of Line 6 was approved by the
NDRC in July 2017 and started construction in January 2018. The first phase of Line 20 was fast tracked from Phase IV to provide a shuttle between
Line 11 and a new International Convention Center, now called Convention & Exhibition City. The construction started in September 2016, but as for early 2019, the construction is paused because the Development and Reform Commission did not approve the project. The Phase IV revised plan approved by the
NDRC on March 26, 2020, approved the first Phase of Line 20 allowing for construction to continue. The line eventually opened on December 28, 2021. Futian to Gangxia North in the first section of Phase 2 of Line 11 opened on October 28, 2022 in tandem with Line 14 Phase I. Soon after, Line 6 Branch and Line 12 Phase I opened on November 28, 2022, and Line 16 Phase I opened on December 28, 2022. Two years later, Line 3 Phase IV, Line 7 Phase II, Line 11 Phase II, Line 12 Phase II and Line 13 Phase I south section opened on December 28, 2024. On 28 September 2025, Line 6 Branch Phase II and Line 16 Phase II opened, and three months later, Line 8 Phase III, the remaining station of Line 11 Phase II and Line 13 Phase I north section opened on 28 December 2025, bringing the length of the Shenzhen Metro to . ==Future expansion==