Polyester twisted yarn is made of PET, spun preoriented polyester yarn (POY) at high speed, and then processed by drafting and twisting. It has the characteristics of short time, high efficiency and good quality. In addition to the characteristics of general polyester fracture strength, good heat setting, good resilience, heat resistance, light resistance, strong corrosion resistance, easy to wash and dry, it also has the characteristics of high bulk, good heat insulation, comfortable feel, soft light and so on.