During the operation of the bag filter, the dust in the air contains more water and oil, as well as hygroscopic and deliquescent dust, and a water film may be formed on the surface of the dust to increase the adhesion, which helps to collect dust. However, it will cause difficulty in cleaning, especially when the high-temperature gas is in a high-humidity state, condensation occurs due to the cooling effect of the external gas, which not only can cause the trapped dust to foul on the surface of the filter material, and is blocked. It can increase the running resistance of the dust removal equipment and directly affect the normal operation of the dust removal equipment. Water-repellent and oil-proof needle felt can effectively prevent water and various oils from adhering and penetrating. Compared with ordinary filter materials, it not only has waterproof and oil-repellent properties, but also has anti-caking properties and easy peeling properties for dust.