The invention discloses a method for preparing a decorative plastic surface vacuum-coating film having effects of electromagnetic radiation resistance, static conduction, hardness improvement, color adjustment, wear resistance and worm damage resistance. The method comprises the following steps of a, cleaning the plastic surface and carrying out flattening treatment, b, sealing the plastic surface by an amino airtight resin, c, putting the plastic into a cleaning tank containing diluted acid or diluted alkali, carrying out cleaning and carrying out drying, and d, carrying out film vacuum-coating on the dried plastic surface so that metal is deposited on the plastic surface and forms a continuous and uniform film containing the metal and metal oxides. The plastic product material obtained by the method has electromagnetic shielding effectiveness above 30dB in a frequency band of 30MHz to 1.5GHz and satisfies electromagnetic shielding and static conduction requirements. The method has simple and feasible processes, is environmentally friendly and efficient, can be used at a low temperature and is suitable for industrial large-scale production. Through the film, a plastic surface color can be adjusted according to demands and plastic surface hardening, corrosion resistance, wear resistance and good appearance are realized. The method greatly broadens plastic purposes, improves a plastic grade and realizes efficient plastic utilization.