Liu competed at the
2020 Summer Olympics. Partnered with
Li Junhui, he won a silver medal in the men's doubles after being defeated by
Lee Yang and
Wang Chi-lin of Chinese Taipei in the final in straight games, 18–21, 12–21. In 2022, Liu started a new partnership with
Ou Xuanyi after Li Junhui's retirement. In the
Indonesia Open, the duo beat Korea's
Choi Sol-gyu and
Kim Won-ho to become the first men's doubles pair from the reserves’ list to win a Super 1000 title. They qualified to compete at the
World Tour Finals and emerged victorious after beating
Mohammad Ahsan and
Hendra Setiawan in the final. In 2023, Liu and Ou helped the Chinese national team reach the
final round of the
Sudirman Cup. Facing
former world no. 1 pair
Takuro Hoki and
Yugo Kobayashi in the semi-finals while Japan was leading the tie 2–1, Liu and Ou saved four match points being down 16–20 in the deciding set and converted their first to keep China alive in the tie. They eventually got into the final. Liu said after the match, "We didn’t think too much. We played each point. We kept doing what we did towards the end. It’s unbelievable." After compatriot and world no. 1
Jia Yifan won the deciding rubber, she stated, "We wouldn’t be here if not for the men’s doubles, they did a great job." Ultimately, the Chinese national team went on to win the 2023 Sudirman Cup. Liu competed at the
2024 Summer Olympics, but failed to make it into the knockout tournament. Some fans and commentators have attributed Liu pair's absence from the knockout tournament to his
group being ridiculously stacked compared to the other groups. In addition,
Kim Astrup, whose pair was in the same group as Liu's, remarked that making it into the quarter-finals from their group deserved a medal on its own due to how loaded their group was. On 19 August 2024, Liu announced his retirement from international badminton. His farewell party was held after the 2025 BWF World Tour Finals in Hangzhou. == Personal life ==