Combined type milling cutter for machining flat surface of aluminum alloy

The invention belongs to a combined type cutting tool for milling a wide flat surface of an aluminum alloy, in particular relates to a combined type milling cutter for machining a flat surface of the aluminum alloy. The milling cutter comprises a cylindrical tool pan, a high-speed steel tool mounting handle and a hard alloy tool mounting handle, wherein the high-speed steel tool mounting handle and the hard alloy tool mounting handle are arranged at the bottom of the tool pan; concave grooves are formed on both mounting handles; the high-speed steel tool mounting handle is provided with a high-speed steel tool; the hard alloy tool mounting handle is provided with a hard alloy tool; the tool noses of both the high-speed steel tool and the hard alloy tool and the center of the tool pan form a straight line; and the high-speed steel tool is arranged in a hole of the high-speed steel tool mounting handle, and the height relative to the high-speed steel tool mounting handle is adjustable. The milling cutter has th