Spiral three-edge milling cutter

The utility model discloses a spiral three-edge milling cutter which comprises a cutter handle part and a cutter edge part, the cutter edge part is arranged at one end of the cutter handle part, and feed of the cutter edge surface of the milling cutter is facilitated through large fall between a front cooling surface and the cutter edge surface of the milling cutter. Polishing treatment is conducted on the joint of the main milling edge face and the auxiliary milling edge face and the joint of the auxiliary milling edge face and the rear cooling face, the milling edge face and the rear coolingface are combined together to form a three-face edge structure, the area of a milling machining face is increased, the cutter cost is reduced, the polished three-face edge structure is smoother in surface, and the main milling edge face is sharper. Burr generation is effectively reduced, the machining precision of the workpiece is improved, the six main milling blade faces are spirally distributed through the unique dist