Cutting tool for processing back surface of tractor shell, and processing method

The invention relates to a cutting tool for processing the back surface of a tractor shell, and a processing method. The cutting tool for processing the back surface of the tractor shell comprises a cutter handle, a connecting part, a front cutter rod, a blade, a locking screw and a cutter bit, wherein the cutter handle is arranged at one end of the front cutter rod; the cutter bit is arranged atthe other end of the front cutter rod; the connecting part is arranged between the cutter handle and the cutter bit; the cutter handle, the connecting part, the front cutter rod and the cutter bit arecoaxial; the blade is fastened onto the cutter bit through the locking screw; the connecting part is a cylinder; the end surface of one end, close to the cutter handle, of the connecting part is a plane perpendicular to the axis of the cutter handle; the outer diameter of the connecting part is larger than the outer diameter of the cutter handle; a cooling liquid feeding hole is formed in the center of the cutter handle;