Polypropylene raw material heated melt, in the process of wire drawing through the spinneret coking matter, it is easy to block the spinneret hole affect the quality of wire drawing. The ultrasonic cleaning machine is used to clean the spinneret, and the impact force of cavitation bubbles is utilized to remove the remaining coking matter in the spinneret micropores quickly in a very short time, which saves time and effort and achieves an ideal cleaning effect.