Machining method of skin mold with chemical milling function

The invention belongs to the technical field of metal plate tool manufacturing, and relates to a machining method for a skin mold with a chemical milling function. The method is characterized in that the material thickness size (the thickness of a chemical milling sample plate) is reserved to complete numerical control machining (primary machining) of a chemical milling skin profile; and then, after the skin mold is stretched and formed and the chemical milling skin is completed, the skin mold is aligned for the second time, numerical control machining for removing the reserved allowance is carried out on the skin mold again, namely, the theoretical mold profile is obtained, and the skin mold is used again at the moment to complete manufacturing of the aircraft skin part. According to the manufacturing method, secondary alignment is carried out on the skin mold, manufacturing of the chemical milling sample plate and manufacturing of aircraft skin parts are achieved at the same time, and the working procedures