The invention provides scratch-resistant plastic surface printing extinction oil and a preparation method thereof. The surface printing extinction oil comprises the following components: 20-30% of a vinyl chloride-vinyl acetate resin solution, 15-25% of a polyurethane solution, 1-5% of an auxiliary agent, 10-20% of a filler, 1-3% of polyethylene wax and 25-40% of a mixed solvent. By adding polyurethane and vinyl chloride-vinyl acetate resin, the cooking resistance of the ink is improved, and by adding the scratch-resistant agent, the scratch resistance of the ink is remarkably improved, so that the produced ink has the characteristics of scratch resistance (no scratch after fingernail scratching), high temperature resistance, no discoloration, safety, environmental protection and high stability, and the product of the PET base material is packaged, after extinction oil is printed on the back face according to the design layout, the extinction film printing effect can be achieved, meanwhile, the bright layer and the dark layer are clear, the emphasizing effect is prominent, and the packaging aesthetic feeling is enhanced. At present, online shopping is popular, a plurality of dried fruits, red dates, masks and other products sold online are packaged by adopting the package, and the market demand becomes larger and larger.