PTFE (Polytetrafluoroethylene) film-coated needled felt filter bag

The utility model relates to the technical field of filter bags, in particular to a PTFE (Polytetrafluoroethylene) film-coated needled felt filter bag, which comprises a filter bag body and a filter assembly, and the filter assembly comprises a plurality of butt joint blocks, a filter screen and a plurality of connecting pieces; the connecting piece comprises a connecting block, a spring, a sliding block and an inserting rod; the connecting block is provided with a slot; when the filter screen is installed, the insertion rods are pulled out of the insertion grooves, the springs drive the sliding blocks to move and stretch the springs, then the connecting blocks are inserted into the butt joint blocks, then the insertion rods are loosened, the insertion rods are inserted into the insertion grooves in the connecting blocks under driving of the springs, and therefore the filter screen is fixed to the inner side of the filter bag body. During use, the filter bag body is connected with a dust remover, dust-contain