Cooling device based on fan motor

The utility model discloses a heat radiation device based on a fan motor, comprising a housing, the inner wall of one side of the housing is provided with the fan motor, the outer wall of one side ofthe housing is provided with a fixed mesh enclosure, the circumference of the fixed mesh enclosure is connected with a movable mesh enclosure through a bolt, the output shaft of the fan motor is provided with a rotating shaft, and the circumference of the rotating shaft is provided with fan blades. A mounting plate is arranged at the circle center of the movable mesh enclosure, a fixed magnet piece is arranged on the side, close to the fixed mesh enclosure, of the mounting plate, a groove is formed in one end of the rotating shaft, an extension rod is inserted into the groove, and an arc-shaped plate is arranged at one end of the extension rod. After the movable mesh enclosure and the fixed mesh enclosure are buckled, the fixed magnet piece and the connecting iron piece are attracted, thearc-shaped plate and the m