The invention relates to a method for recycling waste PET and producing environment-friendly type plastic shopping bags. According to the technical scheme, the method includes the following steps of PET recycling, wiredrawing, weaving, printing, compounding, cutting, sewing and packaging. During wiredrawing, dried raw materials are matched with color master batches and flame retardant raw materials, heating and melting are conducted through a heating medium, and ultrasonic processing is adopted during melting. The method has the advantages that after waste PET is subjected to ultrasonic coprocessing during direct melting, melting rate is increased, the quality of produced products is more balanced, and wires are more uniform in strength; due to reasonable parameters, the effect of the products is better, and the quality of the products is strengthened.