L-ascorbic acid-salicylic acid ester (LOHB) was synthesized by the chloride method using L-ascorbic acid (LA) with excellent antioxidant ability and salicylic acid (SA) with good UV absorption ability as raw materials, which possesses the properties of each of the two. The DPPH radical scavenging rate of LOHB has reached 90% at 40ug/ml, and the absorption of UVB, UVC and UVB has been realized at 0.5mg/ml. UVB and UVC absorption. LOHB was added to gelatin solution, and the composite film was prepared by casting, and its antioxidant and UV resistance was significantly improved, and the DPPH radical scavenging rate was 62%, as well as the absorption of UVB and UVC had been achieved. Corn alcohol soluble protein and rosin were laminated with the composite film to improve the moisture resistance of the monolayer film, and the moisture absorption rate decreased from 95% to 40%. At the same time, the performance of the constructed bilayer film was further improved, with a free radical scavenging rate of more than 90% as well as partial absorption of UVA on top of the monolayer film, further expanding the potential application range of the film.