The invention discloses an electric mechanical bearing bush grinding device and a bearing bush grinding method. According to the electric mechanical bearing bush grinding device, the four corners of abearing bush grinding base are correspondingly provided with lifting motors, each lifting motor is connected with a lifting supporting column, and lifting sleeves are arranged at the upper ends of the lifting supporting columns; the four lifting sleeves are connected end to end through two transverse rods and two longitudinal rods to form a square frame structure, longitudinal moving blocks are correspondingly arranged on the two longitudinal rods in a sleeving mode, the two longitudinal moving blocks are correspondingly provided with moving motors, and the two moving motors synchronously drive the two longitudinal moving blocks to move left and right on the longitudinal rods; the lower portions of the longitudinal moving blocks are correspondingly connected with lifting rods, a hobbing cutter shaft is installed at one ends of the two lifting rods through a rotating seat, and a hobbing cutter shaft gear is arranged at one end of the hobbing cutter shaft; a hobbing cutter shaft motor is arranged on one of the longitudinal moving blocks, a rotating shaft gear is arranged on a rotating shaft of the hobbing cutter shaft motor, and the rotating shaft gear is in transmission connectionwith the hobbing cutter shaft gear through a chain; and a bearing bush clamping table is arranged in the middle of the bearing bush grinding base and is used for clamping a bearing bush, and the hobbing shaft is provided with a hobbing cutter for performing grinding on the bearing bush.