Cutting device for large crankshaft machining

The invention discloses a cutting device for large crankshaft machining, and belongs to the technical field of machining equipment, the cutting device comprises a cutting part and a polishing part, the cutting part comprises a sliding frame and a tool apron, the sliding frame is installed on the side edge of a base, the tool apron is installed on the sliding frame in a matched mode, and the tool apron moves in the length direction of the sliding frame; the moving direction of the sliding frame is consistent with the moving direction of the fixing part, the grinding part comprises a ring seat, a fixing seat and a clamping seat, the ring seat is installed on the base through the fixing seat and adjusted by changing the position of the fixing seat, the clamping seat is installed in the ring seat in a matched mode and moves along the inner wall of the ring seat, and the clamping seat is connected to a connecting rod of the crankshaft body in a sleeving mode. And the surface of the connecting rod of the crankshaft