An active heat-radiating structure attached to a passive heat-radiating part comprises a fan, an outer frame, and two mounting members. The outer frame comprises two first connecting portions arranged at two opposite sides of the outer frame, the two mounting members are disposed on the passive heat-radiating part and connected with the outer frame. Each mounting member is provided with a first mounting portion connected with one first connecting portion. Further, each first connecting portion comprises a track provided with a plurality of positioning points and a guide groove disposed in parallel with the track, and each first mounting portion comprises at least one elastic sheet stressed to move on the track and limited by the positioning point, and a guide block stressed to slide in the guide groove. The position of the fan is adjusted by the two first connecting portions and the two first mounting portions.