Air pollution from the air inhaled at the bottom of the H600 machine, after 90 degrees rise, macromolecular particles are blocked in the primary filter layer, second layer of air through the centrifugal force generated by the rotation of the turbine, oil mist easily together, and converted into liquid. The liquid water through the internal spiral groove flow through the side drain back the machine used repeatedly. The filter of multi-level energy efficient, can absorb fine particles, avoid the emission of pollutants in the workshop.