Polyvinyl alcohol film is colorless and transparent, with good mechanical strength, smooth surface without stickiness, low gas permeability of hydrogen, oxygen, carbon dioxide, good oil and solvent resistance, high moisture permeability, no static electricity, No vacuuming, good printing performance and so on. As a packaging material, PVA can prevent the intrusion of oxygen to prevent the oxidative deterioration of the product, and can prevent the escape of aroma, fragrance and carbon dioxide, so as to prevent the product from losing its due flavor or stale, and greatly prolonging the shelf life. It is the best barrier layer found so far. This material is superior to the currently widely used PVDC film and has broad application prospects.