The utility model provides a motor fan cover's assembly structure assembly, including motor fan cover, motor fan cover sets up in the rear end cap department of motor, a plurality of lugs of equipartition on the outer circumference of rear end cap, motor fan cover include a fan housing section of thick bamboo, be equipped with the flange just with the axle sleeve outside the front end of a fan housing section of thick bamboo the flange links firmly with fan housing section of thick bamboo excircle phase, and the preceding terminal surface subsides of flange are located the rear end face of lugand flange and lug adoption tang are joined in marriage and are connect, and the rear end of a fan housing section of thick bamboo is equipped with the back lateral wall, just the coaxial inlet scoopof having offered on the back lateral wall, the coaxial air suction mouth that is equipped with in the inlet scoop. The utility model discloses can guarantee the axiality of a fan housing section ofthick bamboo, air suction mouth and fan, avoid air suction mouth to interfere with wind vanes and wipe mutually, effectively promote the fan efficiency, improve the electric machine cooling ability, reduce the ventilation noise.