ASA resin is formed by blending polyacrylate core-shell copolymer with SAN, which can significantly improve the weather resistance of ASA resin and low temperature or normal temperature impact resistance, and does not affect other physical properties of ASA resin, making ASA resin easier to process, Excellent surface finish and good rigidity can be widely used in various co-extruded plastic products or other plastic products. Another aspect of the present invention provides a plastic film comprising the ultraviolet-resistant weather resistant ASA resin as described above. In the specific molding, the components of the above-mentioned formulation are blended, stirred and mixed uniformly in a high-speed mixer, and then granulated, and the granulated resin is heated and melted by an extrusion molding machine, and the formed film is stretched.