Polylactic acid fiber is made from starch-containing agricultural products such as corn, wheat, sugar beet, etc., after fermentation to produce lactic acid, and then made by polycondensation and melt spinning. Polylactic acid fiber is a raw material that can be planted, easily planted, and waste A synthetic fiber that naturally degrades in nature. It can be decomposed into carbon dioxide and water through the action of microorganisms in soil or seawater. When burning, it will not emit toxic gas and will not cause pollution. It is a sustainable ecological fiber. The fabric has good hand feeling, drape, UV resistance, low flammability and excellent processing performance, and is suitable for various fashion, casual wear, sporting goods and sanitary products, and has broad application prospects.