The space occupied after the bag dust collector is only half of that of the bag dust collector with the same filtration area. The inherent inertness of the resin itself and its smooth surface make it almost impossible for powders to have physical and chemical reactions and adhesion phenomena with other substances. The rigid structure of the filter plate also makes the pulse back-blow airflow spray out from the gap without any deformation of the filter sheet. When the pulse back-blow airflow directly passes through the filter sheet from inside to outside and acts on the powder layer, the dust attached on the surface of the filter plate can be removed instantly. The effect of the pulse back-blow airflow will not be weakened as it would if absorbed and buffered by a deformed fabric bag.