The utility model adopts a novel composite non-woven fabric as a filter material, and is processed into a plurality of filter bags, and the bag mouth is fixed with a metal frame. The utility model has the advantages that the filter bag can be repeatedly cleaned and replaced conveniently. Widely used in electronics, precision instruments and meters, machinery, metallurgy, chemical industry, textile industry, light industry, medicine, food and other departments and new air purification air outlet.