The utility model relates to a milling powerplant for a copper electrolysis anode plate, belonging to the field of smelting machinery equipment for nonferrous metal. The milling powerplant comprises a butt mill, a tie-plate, a shaft, an end cover, an adjustable pad, a precision angular contact ball bearing, a main shaft housing, a space ring, a precision bearing lock screw cap, a cover plate, a gland bush, an angular contact ball bearing, a rear end cover, a main shaft belt pulley, an installation seat, and the like. The milling powerplant comprehensively processes the mould casting obliqueness and the conducting contact face of suspension loops, and mills and eliminates the stripping taper, surface oxide layers of the loops and cast flashes so as to improve the suspension state of the anode plate in an electrolytic tank and the current-conducting contact states of the loops and current-conducting plates. The utility model has the advantages of high cutting efficiency, durability, reliability and long service life.