The main function of food plastic packaging is to protect food and make it easy to carry, transport and preserve. It is closely related to people's life and health. Therefore, in order to prevent food pollution and spoilage, it not only requires the appearance of food packaging to be beautiful and practical, but also to improve the quality to ensure food safety. This undoubtedly puts forward higher requirements for food plastic packaging products. The plastic packaging used for food must have appropriate barrier, such as high oxygen resistance and oil resistance for fatty foods, high humidity resistance for dry foods, and high resistance for aromatic foods; Fruit, vegetables and fresh foods require a certain degree of oxygen, carbon dioxide and water vapor permeability.