Unique design of high precision filter element, large filter area, high dust removal rate. The hopper type dust collecting protective cover improves the dust collecting efficiency and the equipment operation safety. The dust suction fan is directly connected with the filter element, which reduces the resistance, improves the dust suction effect and saves the energy consumption of the fan. The filter element is convenient to unload and clean ash, does not need compressed air to clean ash repeatedly, prevents dust and fireproof flower semicircular baffle, eliminates fire safety hazards and is conducive to dust settlement. Suitable for plumbing, hardware, lighting, locks, knives, tableware, auto parts, etc.