Cleaning method of high-molecular polymer melt spinning spinneret plate

The invention discloses a cleaning method of a high-molecular polymer melt spinning spinneret plate. The cleaning method comprises the following steps: putting a detached spinneret plate into ultrasonic cleaning equipment containing xylene and carrying out soaking and ultrasonic cleaning to obtain a pretreated spinneret plate; blow-drying the pretreated spinneret plate and carrying out spinning hole detection on the blow-dried spinneret plate; putting the blow-dried spinneret plate with more than 80% of spinning holes as through holes into a salt bath furnace for preheating and salt bath to obtain a salt bath spinneret plate; cooling the spinneret plate subjected to salt bath and then carrying out ultrasonic cleaning and blow-drying on the spinneret plate to obtain a spinneret plate subjected to primary water washing and blow-drying; putting the spinneret plate subjected to primary washing and blow-drying into an accommodating tank containing dilute nitric acid for soaking to obtain anacid-washed spinneret pl