Zheng Long started his football career after he graduated from top tier Qingdao Jonoon's youth academy in 2006.

Throughout the 2007 season, he would start to gain significant playing time and go on to score his first goal of his career, which was a free kick in a league game on 7 April 2007 against Changchun Yatai in a 2-1 defeat.

[2] On 19 July 2013, Zheng was loaned to fellow Chinese Super League side Guangzhou Evergrande until 31 December 2013.

[6] On 26 February 2019, Zheng was loaned to fellow top tier side Dalian Professional for the 2019 season.

[9] He would go on to establish himself as regular within the team that gained promotion to the top tier at the end of the 2022 China League One campaign.