He forged a new mixed doubles pairing with Huang Yaqiong in November 2017, and started their partnership by winning the China, Hong Kong and Macau Open in consecutive weeks.

They won a silver medal after being defeated by their compatriots Wang Yilyu and Huang Dongping in the final in a close rubber game.

[8][9] Zheng participated in the German Open, but with a new partner, Zhang Shuxian, in which they were knocked out in the first round by Jones Ralfy Jansen and Linda Efler.

They were crowned as the champions, avenging their defeat in the Tokyo Olympics against Wang Yilyu and Huang Dongping in the final without dropping a game in the whole tournament.

In August, competing as the top seed in the World Championships, Zheng and Huang got their third gold medal of this event in their career by beating Yuta Watanabe and Arisa Higashino, who were fighting in home soil, in two straight games.

Zheng and Huang competed as top seeds and three-time defending champions in the Malaysia Open at the start of the year.

[14] At the end of April, Zheng and Huang participated in the Asian Championships as defending champions, and finished with a silver medal after losing to their younger compatriots Jiang Zhenbang and Wei Yaxin.

[15] In May, the pair then helped the Chinese team to lift the Sudirman Cup trophy by winning all 4 matches they played.

[16] In June, after losing to Kim Won-ho and Jeong Na-eun in the quarterfinals in Singapore,[17] The pair won their third Super 1000 title of the season in the Indonesia Open, defeating Watanabe and Higashino in straight games in the final.

However, they returned to competition at the Indonesia Masters, which was held a week after the India Open, and they won the title.

[23] In November, Zheng announced his retirement from international badminton, citing needing a balance between career and family.

[7] The following month, Zheng and Huang won the World Tour Finals after defeating Chen Tang Jie and Toh Ee Wei in a grueling three sets match of 21–18, 14–21, 21–17.