Dust removal filter bag

The utility model relates to a dust removal filter bag which comprises a filter bag body, an inner polytetrafluoroethylene layer is arranged on the inner wall of the filter bag body, an outer polytetrafluoroethylene layer is arranged on the outer wall of the filter bag body, a glass fiber layer is arranged on the inner side of the inner polytetrafluoroethylene layer, and a fixing ring is arranged in the filter bag body. A fixing ring is arranged on the inner wall and the outer wall of the filter bag body, a plurality of supporting frames are arranged on the lower end face of the fixing ring and are arranged in a circumferential shape, and a supporting ring is fixedly arranged on the lower end face of each supporting frame. The corrosion resistance of the filter bag body can be improved by utilizing the acid resistance and alkali resistance of the inner polytetrafluoroethylene layer, so that the service life of the filter bag body is prolonged, and the glass fiber layer is arranged on one side of the inner pol