The invention discloses a coating method for a discontinuous mirror surface white film. The coating method comprises the following steps of firstly spraying a UV (ultraviolet) base film on a product to be coated; then sequentially coating an SiO2 film, a TiO2 film, the SiO2 film, the TiO2 film and the SiO2 film on the product with the UV base film through an optical vacuum coating technology, wherein SiO2 and TiO2 are environment-friendly raw material; and finally spraying UV finish paint so as to complete coating. According to a film interference principle, all parameters of the optical vacuum coating technology are designed and optimized by adopting the environment-friendly raw material SiO2 and TiO2 through the optical vacuum coating technology according to the specific characteristic of cellphone plastics, so that the prepared product has the advantages that the film has good adhesive force, the metal texture is strong, the weather resistance is good, the mechanical strength resistance is good, the film is not easy to oxidized when being exposed in air for a long time, and the like. The coating method is simple to operate, has no pollution, has stable preparation technology and is applicable to mass production.