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The cooking fume generated by the catering industry contains a lot of harmful gases, while the traditional cooking fume exhaust equipment directly discharges the cooking fume exhaust gas without any decontamination treatment into the air, thus seriously polluting the living environment, harm to human health, urgent need for treatment. In order to solve the environmental problems caused by cooking fume pollution, an intelligent device was designed to improve the purification efficiency of cooking fume. The device monitors the concentration of oil fume and the PH value of electrolyte in real time, and by controlling the intensity of ultrasonic atomization, ejecting an appropriate amount of alkaline water mist to promote the emulsification of oil fume, it will not cause secondary environmental pollution by overspraying alkaline water mist. At the same time, monitor the particle concentration of environmental pollution, turn on the negative ion generator, produce the right amount of negative ions and oil fume particles combined to make oil fume particles larger and easier to deposit, improve the efficiency of oil fume exhaust gas purification. The deposited oil fumes flow down the pipeline not only to clean the adhesive oil and dirt automatically, but also to facilitate the collection and recycling. The experimental results show that the device is not only effective in purifying the oil fume, but also improves the environmental air quality. It is energy-saving and environment-friendly, it has good practicability and wide application prospect.