Metallized film makes plastic film widely used. There are many methods to form conductive film on the surface of plastic film. Among them, vacuum plating film forming method can be divided into three types: vacuum evaporation, ion plating, and vacuum evaporation. In the vacuum of -3MPa, heating the metal to above the melting point, thereby generating metal vapor, so that the metal vapor diffuses and condenses on the surface of the cold plastic film, and a uniform metal film layer is formed on the surface with conductivity; ion plating is 10 -8-10-3MPa vacuum luminous discharge mist, make metal atoms ionized, the substrate is negatively charged, and after accelerated ionization, a metal film is obtained on the surface of the plastic film.