The invention relates to an end cover of a motor. The end cover comprises an end cover body, a bearing assembly and a connection flange and is characterized in that: the end cover body is provided with the bearing assembly and the connection flange; the bearing assembly and the connection flange are divided into two parts; and the bearing assembly is connected with the connection flange through a reinforcing rib. The end cover body is provided with a ventilation duct. The invention has simple, compact and rational structure and good radiation and motor ventilation effects; the temperature of the bearing assembly is obviously reduced, and the temperature of the bearing assembly of the 250 motor is reduced by 7 to 8 DEG C, therefore the service life of the bearing assembly is greatly prolonged and the reliability of the motor is improved; and moreover, the materials of the motor are saved, the aim of lowering cost is achieved, and 1 to 2 Kg of materials can be saved for the end cover of the motor.