[1] Mao Weijie was born in Wafangdian, a county-level city under the administration of Dalian, Liaoning Province.
He began playing football in elementary school and started formal training under coach Ji Xuemin in fifth grade.
By sixth grade, he moved to Dalian to attend Gan Jingzi Sports School, where he further developed his skills.
In the 2024 season, he contributed 3 goals and 2 assists in 28 appearances for Dalian Yingbo, aiding their promotion to the Chinese Super League.
He participated in the 2025 AFC U20 Asian Cup, scoring a goal and providing an assist in a 5-2 victory over Kyrgyzstan.