A fan-fixing device for fixing a fan on an installation panel which has a plurality of holes includes a body, a driving part and an elastic assembly. The body has a fixing portion for fixing the fan, at least one track is formed on a side thereof, and at least one first combined part is disposed on an opposite side thereof, wherein the combined part penetrates at least one of the holes. The driving part slidably disposed on the track. The driving part further has at least one second combined part, which penetrates at least another one of the holes. The elastic assembly is arranged between the body and the driving part. As a result, the first combined part and the second combined part can be fixed in the holes via force pushing the driving part, and can be departed from the holes via releasing the force.