Precise metal part surface treatment polishing device

The precision metal part surface treatment polishing device comprises a machining table, a supporting seat is fixedly connected to the machining table, a cavity is formed in the supporting seat, bearings are installed on the inner walls of the two sides of the cavity, and the ends, away from each other, of the two bearings extend to the outer side of the supporting seat; two bearings are arranged in the cavity, the inner rings of the two bearings are fixedly sleeved with the same adjusting rod, one end of the adjusting rod is fixedly connected with a rotary knob, a limiting mechanism is arranged in the cavity, the limiting mechanism comprises a limiting gear and two limiting racks, the two limiting racks are both meshed with the limiting gear, and a clamping mechanism is arranged at the other end of the adjusting rod. The fixed clamping plate arranged on the adjusting rod can be matched with the movable clamping plate to clamp the metal part, and when the two limiting racks are extruded to be separated from t