China competed at the 2018 Summer Youth Olympics, in Buenos Aires, Argentina from 6 October to 18 October 2018.

Teams made up of athletes representing different National Olympic Committees (NOCs), called mixed-NOCs teams, participated in the 2018 Summer Youth Olympics. These teams participated in either events composed entirely of mixed-NOCs teams, or in events which saw the participation of mixed-NOCs teams and non-mixed-NOCs teams. When a mixed-NOCs team won a medal, the Olympic flag was raised rather than a national flag; if a mixed-NOCs team won gold, the Olympic anthem would be played instead of national anthems. A total of 18 events with Mixed NOCs were held.