Cai Chengjun is a 22-year-old professional football player from CHN. He currently plays for Tianjin Jinmen Tiger, wearing the number 39 shirt. He plays primarily as a Defender.

His most recent move was a from Sichuan Dingyao Zhongteng to Tianjin Jinmen Tiger on 2026-02-26.

Throughout the Chinese U20 National Games 2025, Cai Chengjun featured in 5 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.