Plastic materials have light weight, convenient processing, product aesthetics, economic application and many other excellent performance. Shadow children can be widely used in science and technology, daily life and other fields. China's annual plastic production capacity of more than 20 million tons, ranked in the forefront of the world. Plastic to our life has brought convenience, for science and technology and other fields of development has made due contributions, however, the use of plastic disposable discarded, will cause serious environmental pollution. And, because of waste plastic discarded large, difficult to degrade, difficult to deal with, the impact of a wide, serious pollution, people called "white pollution." It can be seen that the recycling of waste plastics is of great significance for environmental protection, recycling and recycling of resources, and saving energy.