The invention discloses a drug polisher which comprises a body. A fixing rack, a main motor, a hydraulic motor and a hydraulic pump are arranged at the bottom of an inner cavity of the body. The top end of a hydraulic rod in a hydraulic device is hinged to the top end of a polishing rack, and the bottom end of the polishing rack is hinged to the body. The middle of the polishing rack is provided with a plurality of sets of parallelly arranged polishing columns. First gears are arranged on the outer sides of one ends of the polishing columns, and second gears are arranged on the inner side of one ends of the polishing columns. The first gears are connected with the main motor, and the second gears on the polishing columns are connected. The drug polisher has a quite large working area, polishing efficiency can be improved through the synergistic effect of the sets of polishing columns, and by adjusting the working height of the hydraulic device, the polisher can have different working slopes to adapt to drugs of different volumes and in different shapes, and working efficiency of the polisher can be improved to a large extent through arranged multiple sets of feed inlets and discharge outlets.