The biodegradable coffee capsules are made of PLA. PLA is a new type of bio-based and renewable biodegradable material, which is made from the starch raw materials proposed by renewable corn planting. Starch raw materials are saccharified to obtain glucose, which is then fermented by glucose and certain strains to produce high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized by chemical synthesis. It does not pollute the environment, which is very beneficial to the protection of the environment and is recognized as an environmentally friendly material.