The invention discloses a vapor deposition method used for anticorrosion pretreatment of a permanent magnet, and relates to the field of surface treatment of materials. The physical vapor deposition technology is adopted, and a nano multi-layer structural thin film is deposited on a NdFeB surface; before the nano multi-layer structural thin film is deposited on the NdFeB surface, the NdFeB surface can be passivated; after the nano multi-layer structural thin film is deposited on the NdFeB surface, an electrophoretic method is adopted to carry out coating deposition; and the invention discloses a method for carrying out pretreatment on the magnetic material NdFeB so as to replace phosphorization; and through the technology, the NdFeB magnetic performance damage caused by a phosphorization technology can be overcome. The method is green, free of pollution and wide in application prospect, and technological parameters are easy to control; combination performance of a transition metal/nitride composite coating prepared through the method and the NdFeB permanent magnet is excellent, the method is matched with the electrophoresis or plating process, and the anticorrosion performance of the NdFeB permanent magnet can be obviously improved.