The oil fume purification system is a kind of oil fume purification system that exhausts the high-temperature oil fume exhaust gas in the kitchen to the atmosphere through fume hoods, ventilation pipes, fans, purifiers, silencers and air outlets, so as to achieve the purpose of ventilation and cooling in the kitchen. The flue gas purification system consists of five parts: (1) smoke collection hood, commonly known as exhaust hood, gas collection hood, smoke hood and suction hood. Installed above the stove, about 1.8m from the ground, it is used to collect the smoke generated during the catering production on the stove. Made of stainless steel plate or galvanized steel plate. (2) Ventilation pipes collect gas and guide the flow of gas. Most of them are made of stainless steel plate or galvanized steel plate or glass fiber reinforced plastic material. (3) The negative pressure formed during the high-speed operation of the exhaust fan wheel absorbs the indoor oil fume and discharges it outside. (The integrated fume purification unit includes the exhaust part, and no additional fan is needed. (4) lampblack purifier is a device for purifying lampblack produced in the kitchen. (5) The inlet and outlet of the fan in the exhaust pipeline are connected in series with silencers to reduce the aerodynamic noise in the system.