Zheng Junfeng was born in started practicing Sanda at the age of 8. He made his professional debut in 2009 as he was still participating in amateur competitions. In 2011 he placed 5th in the National Tournament. Junfeng's first notable international victory came against the japanese champion
Hirotaka Urabe who he beat by majority decision at Krush 77 on July 16, 2017. On January 13, 2018 Junfeng faced Feng Liang for the vacant -60 kg
Glory of Heroes title at the
Glory of Heroes: Guangzhou event. He lost by unanimous decision. In 2019 Junfeng joined the
Wu Lin Feng organization, the next year he entered the Super Rookie Tournament. He won 4 fights in 3 months to reach the Final. On August 28, 2020 at
Wu Lin Feng 2020: China New Kings Tournament Final Junfeng beat Wang Zhiwei for the Wu Lin Feng China New King title and the IPCC China -63 kg title. He won the fight by unanimous decision.{{Cite web|title=重庆"铁臂侠"获武林风金腰带：选手靠拿它走上人生巅峰，自由搏击挺适合女人小孩 ==Titles and achievements==