The invention discloses a plastic plating method for an automobile component. The plastic plating method for the automobile component is characterized by comprising the steps of chemical degreasing, coarsening, restoring, presoaking, palladium exciting, peptizing, chemical nickel-plating, copper pre-plating, acid-copper-plating, si-bright nickel plating, bright nickel plating, nickel sealing, and chromium plating. The adhesive force of the plastic surface substrate and the plating layer of the automobile component is high, the thickness of the penetration is up to 0.003-0.12 mm, and 0.003-0.12 mm of thicker metal layer is embedded in the plastic surface layer, so that the metal layer is tightly adhered to the plastic substrate, and the phenomenon of loosening, bubbling, peeling and the link of the plating layer is avoided after plating, the surface durability of the product is prolonged, and the product is smooth and has the metallic texture.