The invention belongs to the field of washing machine production devices and particularly discloses a polishing device for a rotating shaft of a washing machine. The polishing device comprises a rack,a polishing motor and a polishing disk. The polishing motor is fixed to the rack. The polishing device further comprises a drive motor, a thread column, a thread piece, a rotation shaft and a fixingpart which can clamp the rotating shaft. The drive motor is fixed to the rack and drives the thread column to rotate. The thread column is rotationally connected with the rack. The end, far away fromthe drive motor, of the thread column is fixedly connected with the fixing part. The thread column is in thread fit with the thread piece. An output shaft of the polishing motor is connected with therotation shaft, the free end of the rotation shaft is connected with the polishing disk, the rotation shaft is provided with a cam, the rack is in sliding connection with a limiting piece which can limit the thread piece from rotating, the cam abuts against the limiting piece, and a spring is arranged between the limiting piece and the rack. The polishing device can polish the rotating shaft of the washing machine uniformly.