Description: Polylactic acid (PLA) is a novel biodegradable material made from starch derived from renewable plant resources such as corn. Starch raw materials through saccharification to obtain glucose, and then from glucose and a certain strain fermentation to produce high purity lactic acid, and then through chemical synthesis method to synthesize a certain molecular weight of polylactic acid. It has good biodegradability, can be completely degraded by microorganisms in nature after use, and eventually generate carbon dioxide and water, which does not pollute the environment, which is very beneficial to the protection of the environment, and is recognized as an environmentally friendly material.