The invention discloses a machining method for an integrated star wheel for a corn harvester, and belongs to the technical field of manufacturing of star wheels. A machining device comprises a vulcanization forming mechanism, a star wheel taking-out mechanism and a mold conveying mechanism, wherein the vulcanization forming mechanism is connected with the star wheel taking-out mechanism through the mold conveying mechanism; the star wheel taking-out mechanism comprises lifting parts, second plungers, second oil cylinders, an ejection pillar, a bottom plate, a third plunger and a third oil cylinder; the third oil cylinder is connected with the bottom plate through the third plunger; the bottom plate is fixedly connected with the ejection pillar; the two sides of the bottom plate are provided with the two second oil cylinders, and the second oil cylinders are connected with the lifting parts through the second plungers; the mold conveying mechanism, a lower machine seat and the bottom plate are located on the same horizontal plane. According to the machining method, a cylindrical rubber blank is adopted for integrally forming a star wheel of the corn harvester in a vulcanization mode. The production efficiency of the star wheel is high, a wheel shaft and a wheel tooth part of the star wheel are integrally formed in the vulcanization mode, wheel teeth are not prone to cracking, and the service life is long.