The invention discloses a displacement device of an abrasive disc. The displacement device is characterized by comprising a base, a box body, a rotary disc, a vertical supporting seat, the abrasive disc, a worm gear mechanism and a driving mechanism, wherein the worm gear mechanism is connected with the driving mechanism and the rotary disc; the vertical supporting seat is vertically arranged on the rotary disc; the abrasive disc is horizontally arranged on the vertical supporting seat; the worm gear mechanism comprises a worm gear and a worm; the worm gear meshes with the worm; the driving mechanism is connected with the worm through a coupling; a rotating shaft of the worm gear is in threaded connection with the rotary disc; the driving mechanism and the worm gear mechanism are arranged inside the base; and the worm gear is arranged inside the box body. The displacement device adjusts the position of the abrasive disc.