The use of polyvinyl alcohol film to preserve fresh eggs can effectively prevent the intrusion of bacteria. The shelf life is 70 to 100 days, and the good rate is over 95%. Fresh eggs cost only a few cents per kilogram of fresh eggs. 1, raw materials. 1) Polyvinyl alcohol, which can form a colorless transparent film, attached to the surface of fresh eggs for protection. 2) Sodium acetate: It is an ideal food preservative. 2, the preparation of preservation solution. Preservation solution concentration is 5% to 7%. After the first 10 kg of water was boiled, 500 g of polyvinyl alcohol was added and the mixture was stirred until it dissolved completely. Add 100 grams of sodium acetate, stir to dissolve, and add boiling water so that the total weight of the solution is not less than 10.5 kg after cooling. Each kilogram of fresh solution can handle 60 ~ 70 kg of fresh eggs. 3, preservation treatment. The coating method depends on the number of eggs. When the amount of water is too high, one by one is used for dipping, and large batches can be dipped. The surface of a fresh egg must be completely covered with a solution, and dried to form a colorless transparent film. During the storage, pay attention to indoor ventilation, regular sampling and inspection to prevent the temperature of the local eggs from rising, affecting the preservation effect. China Agricultural Network Editor