Using degradable material poly (vinyl alcoho1) as substrate, the paper aims to prepare the composite antibacterial film by adding Poria cocos solution and study the effects of different concentrations of Poria cocos on the physicochemical and functional properties of the blend film. Poria cocos/PVA blend film was prepared by solvent casting. The physical mechanics, solubility, light transmittance, antibacterial and degradability of the blend films were investigated. Its structure was characterized by Fourier transform infrared spectroscopy, and scanning electron microscope. The addition of Poria cocos weakened the intermolecular force of PVA, significantly increased the elongation at break from 202.77% to 398.82%, reduced the tensile strength, and formed a hydrogen bond between Poria cocos and PVA, reducing the dissolution of water to the film, and the solubility of the film decreased from 100% to 38.21%. With the increase of Poria cocos concentration, the light transmittance of the film decreased and the antibacterial activity was enhanced. Soil degradation test showes that Poria cocos/PVA blend membrane has good biodegradability. The mechanical properties and water resistance of Poria cocos/PVA blend film are improved, and the composite film has certain antibacterial and degradability. The preparation of the composite film provides an ideal choice for food packaging.