A cup-cover includes a base, a fan blade assembly positioned on an upper portion of the base, a PCB and a power supply respectively connected to the fan blade assembly and received in the base. The base includes a cap portion formed on a bottom thereof to cover a rim of a cup. The fan blade assembly includes a fan housing and an impeller installed in the fan housing. The fan housing is rotatably connected with the base by a connecting member to achieve opening and closing between the fan housing and an upper surface of the base via the fan housing foldably rotating along the connecting member to adjust wind direction of the cup-cover fan.