It is suitable for the treatment of flue gas dust generated by metal cutting. It is efficiently collected by the equipment components at the source of soot exhaust gas, and the volatilization and diffusion of soot and exhaust gas are prevented in time to keep the air in the workshop clean. The absorbed soot exhaust gas is filtered and purified by a high-efficiency filter element with an accuracy of up to 0.3 μm, and will be discharged into a standard clean air chamber to achieve air circulation and reduce energy loss in the workshop temperature and humidity.