PPS+PI composite needle felt can significantly improve the dust retention ability of PPS needle felt, improve dust filtration accuracy with dual anti filter bags, reduce dust emission concentration, and improve the high-temperature and corrosion resistance of the filter material. It can greatly extend the service life of the filter bag, especially for environments with high temperature and concentration of dust containing gases and high purification requirements, which can meet the strict operating conditions of coal-fired boiler electric bag composite dust collectors.