The invention discloses a gear polishing equipment with high polishing precision, which comprises a frame, and a fixed base is arranged on the frame; an adjustment groove is arranged on the fixed base, and a hydraulic cylinder, a fixed plate, a fixed rod and two hydraulic cylinders are arranged in the adjustment groove. An automatic stabilizing device; a plurality of measuring rods with height detection devices are set on the fixed plate; a lifting seat is set on one side of the fixed base, two electric slide rails and a lifting plate are set on the lifting seat, and a fixed lifting plate is set on the lifting plate. Top seat; the fixed top seat is provided with a ring-shaped main pipe, an air intake pipe, a supercritical carbon dioxide gas supply bottle, a plurality of gas outlet pipes, a plasma tube and a ring-shaped feed pipe, and a plasma gas bottle is connected to the top surface of the ring-shaped feed pipe; fixed A plurality of piezoelectric sensors are arranged on the top seat. The invention can not only improve the processing precision, but also has the advantages of low labor intensity, high work efficiency, wide application range, good processing stability, high safety, convenient use, convenient maintenance, convenient cleaning and long service life.