Biodegradable plastics are a feasible and effective way to solve the environmental pollution of plastic waste and alleviate the shortage of petroleum resources, and it is one of the directions for the development of the plastic industry in the future. According to different degradation mechanisms, biodegradable plastics can be divided into incomplete biodegradable plastics and fully biodegradable plastics. Among them, incomplete biodegradable plastic refers to mixing a certain amount of substances with specific degradation in conventional plastics, which cannot be completely degraded by nature (such as PE, PP, PVC, etc.). Completely biodegradable plastic refers to a biodegradable polymer synthesized by natural polymers or agricultural and sideline products through microbial fermentation. After being discarded, it can be 100% degraded by microorganisms such as bacteria and fungi in nature, and finally decomposed into water and water. Carbon dioxide (such as PHA, PHB, PCL, etc.) plays a very good role in protecting the environment, so it is also called "green plastic". According to the composition of the raw materials of plastic products and the preparation method, the fully biodegradable plastics can be divided into microbial synthetic degradation plastics, chemical synthetic degradation plastics and natural polymer blend degradation plastics. In addition to being degradable, this plastic also has properties that are easy to process and meet the requirements for use. As a new type of environmentally friendly material, it is gradually replacing traditional petroleum plastics and entering millions of households.