Axial flow fan

The utility model discloses an axial flow fan. A bearing hole, a stator seat, source leading wire screw holes and a double-sided flange mounting hole are arranged on an enclosure. A bearing is arranged in the bearing hole. A motor stator is fixedly arranged in the stator seat. The bearing is connected with a mandrel which is connected with a rotor. A component of fan blades and the rotor is arranged on the bearing, and the fan blades are fixedly connected to the enclosure. A retaining ring is arranged on the bearing, and is connected with a connecting pipe. An oil seal cover is arranged at the bottom of the enclosure. The axial flow fan has the characteristics of small size, freeness from maintenance and convenience for mounting, and also has the advantages of low energy consumption, low manufacture cost, stable quality, large air flow, low noise, small vibration, running reliability and long service life.