During the operation of the bag filter, for dust in the air that contains more water and oil, as well as hygroscopic and deliquescent dust, a water film may be formed on the dust surface to increase adhesion. Although this helps to capture dust, it will make dust cleaning difficult, especially when the high-temperature gas is in a high-humidity state, condensation occurs due to the cooling effect of the external gas, which can not only cause the captured dust to scale on the surface of the filter material and cause clogging, but also increase the operating resistance of the dust removal equipment, directly affecting the normal operation of the dust removal equipment. Water-repellent and oil-proof needle felt can effectively prevent water and various oily contaminants from adhering and penetrating. Compared with ordinary filter materials, it not only has waterproof and oil-proof properties, but also has anti-caking and easy-to-peel properties for dust.