The motor bearing bush is a core sliding support wearing part for the matched drive motor of a ball mill. It is exclusively installed between the rotor shaft and the motor bearing housing of the ball mill's main drive motor, serving as a critical component to ensure the stable power output of the motor. Together with the ball mill's large gear ring, pinion gear and reducer, it forms a complete transmission chain. Its core functions include bearing the rotational load of the motor shaft, reducing friction loss between the shaft and the bearing housing, and absorbing vibrations from the motor's high-speed operation. Adapted to the heavy-duty working conditions of the ball mill's 24-hour continuous operation, it directly determines the operational stability and service life of the drive motor as well as the continuity of the grinding operation of the entire ball mill unit. It is an irreplaceable basic matched part in the drive system of mineral processing ball mills for mining applications.