Water soluble film is a new type of environmental protection packaging material which can be rapidly degraded by natural factors and processed by special technology. It can be rapidly decomposed and degraded into low component compounds by natural factors, and has the effect of improving land. Therefore, it belongs to a new type of environmental protection packaging material. In Europe, The United States, Japan and other countries have been recognized by the environment department. Because of its environmental protection characteristics, it has been widely regarded by the developed countries. Foreign pesticide, chemical industry and other large companies have widely used water-soluble film packaging their products.