The invention discloses a double-head fixing type axial flow fan. The axial flow fan comprises a motor body, fan blades, a fixing bearing, and a
machine shell, wherein the motor body is provided witha rotating shaft outputting rotating power, and the motor body comprises a
stator and a rotor; the fan blades are assembled to one end of the rotating shaft; the fixing bearing comprises a head end bearing, and a
tail end bearing which are arranged at the two axial ends of the rotor, and the head end bearing and the
tail end bearing are fixed coaxial with the rotating shaft; the
machine shell is wrapped on the outer side of the motor body; and the head end bearing and the
tail end bearing are wrapped by a head wrapping ring and a tail wrapping ring respectively, the head wrapping ring and thetail wrapping ring are fixed to the
machine shell through flow guiding pieces and connecting ribs, a hollow part is formed between the adjacent connecting ribs, and the machine shell forms a through
air channel parallel to the axis direction of the rotating shaft. According to the double-head fixing type axial flow fan, the rotating shaft of the motor is limited by two bearings which are relatively far away from each other, and the two bearings are firmly fixed, so that vibration and
jitter during operation of the axial flow fan can be controlled, and the influence of the arranged bearings onoverall wind resistance is very small.