The high spiral milling cutter is suitable for the processing of aluminum alloy and copper alloy. The slotting design uses a special method of large helix angle and large chip tolerance, and retains a certain cylindrical blade on the outer circle. Under the premise of suitable rake angle, with sufficient cutting space, it can not only ensure the sharpness of the tool but also increase the wear resistance. With the targeted TiN coating, the tool life can be further improved.