Recycled polyester refers to the polyester staple fiber made of waste polyester bottle chips, spinning waste silk and pulp blocks as raw materials, cleaned and reprocessed. It belongs to the resource recycling project and reduces the consumption of oil. Because of its low cost and good performance, it has a broad market. It is very popular abroad, especially in European and American developed countries. It is widely used as toys, quilt clothes, home textiles, shopping bags, bags and so on. The recycling of resources not only avoids the waste of resources, but also greatly reduces the pollution of polyester industry to soil, groundwater and atmosphere. Over the years, the production of recycled polyester staple fiber has played an irreplaceable role in green environmental protection, circular economy and improving economic benefits