The Zein/chitosan (CS) composite film with high content of Zein was prepared by casting method, and the film was blended and modified by composite additives [m(glycerol):m(polyethylene glycol 400)=1:1]. The effects of the additive amount of the composite additives (0, 0.5%, 1.0%, 1.5%, 2.0%, respectively, based on the total solution mass) on the mechanical, optical and thermal properties of the film were studied. The morphology and structure of the film were characterized by SEM and FTIR. The results showed that the composite additives could achieve the plasticizing effect by weakening the intermolecular force between Zein and CS, and the comprehensive mechanical properties of the film are improved. With the increase of the additive amount of the composite additives, the elongation at break of the film gradually increased, and the tensile strength decreased and then increased, the WVP increased gradually, the water contact angle decreased gradually, and the hydrophilicity of the film increased. Compared with the film without composite additives, when the concentration of composite additives reached 1.5%, the tensile strength decreased by 27.40%, the breaking elongation increased by 39.87%. The barrier performance decreased, and the WVP increased by 29.10%. Through the observation of SEM and DSC, the compatibility between Zein and CS was improved after adding composite additives, and the surface of the prepared film was more flat and smooth. with high content of Zein, the Zein/CS film has the best performance when the concentration of the composite additive is 1.5%. Adding curcumin to zein/cs composite membrane could effectively improve the oxidation resistance of the film, and with the increase of curcumin content, the proportion of bound water in the film increased, and the mechanical properties of the composite membrane were better than those without curcumin.