In the wave of green circular economy, Recycled PET materials, with their excellent performance and characteristics, have shown broad application prospects in the fields of textiles, packaging, etc. With the continuous promotion of high-standardization and high-value-added products, some high-end recycled PET products have even entered the hall of food-grade applications, setting a new benchmark for the industry. In recent years, with the improvement of environmental awareness and the continuous progress of recycling technology, optical sorting technology has achieved remarkable results in the field of recycled PET recycling. As a key tool in this field, color sorters are widely used in the sorting process of recycled PET of different colors with their efficient sorting capabilities. At the same time, material sorters have also demonstrated the ability to identify and separate recycled PET material differences to a certain extent.