The production of polylactic acid is based on lactic acid. Traditional lactic acid fermentation mostly uses starchy raw materials.At present, the United States, France, Japan and other countries have developed and used agricultural and sideline products such as corn, sugar cane, sugar beet, and potatoes as raw materials to ferment lactic acid, and then produce polylactic acid. Corn is the preferred raw material for the biodegradable plastic polylactic acid.