Si Yu is a 27-year-old professional football player from CHN. He currently plays for Beijing Women, wearing the number 17 shirt. At the international level, he represents China U19 Women. He plays primarily as a Defender. He stands at 169cm tall and weighs 56kg.

His most recent move was a from Changchun Dazhongzhuoyue Women to Beijing Women on 2026-03-06.

Throughout the CFA Women's Super League 2025, Si Yu featured in 21 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.