Li Xun started his professional football career in 2013 when he was promoted to China League One side Yanbian FC's first team squad.
[3] On 5 March 2016, Li made his Super League debut in the first match of 2016 season against Shanghai Shenhua, coming on as a substitute for Yoon Bit-garam in the 91st minute in a game that ended in a 1–1 draw.
[4] Despite being an integral member of the squad that helped maintain Yanbian's status within the top tier throughout the 2016 Chinese Super League season, Li was unceremoniously dropped to the teams bench throughout the whole of the 2017 Chinese Super League and saw Yanbian relegated at the end of the season.
[5] Speculation within the Chinese media suggested that the owners were unhappy with how Li's contract negotiations went and that he was actively looking to move.
On 28 February 2019, Li joined second-tier club Shijiazhuang Ever Bright (now known as Cangzhou Mighty Lions) and was placed in their reserve squad.