Method for purifying cooking fume

The invention discloses a method for purifying cooking fume, and belongs to the technical field of air pollution control. The method for purifying the cooking fume comprises the steps that a rotary discharge module is provided, the rotary discharge module comprises a center rod and a plurality of barb corona electrodes, the center rod is arranged parallel to the airflow flowing direction, the barb corona electrodes are arranged around the center rod to form a preset pattern, and the section of the preset pattern is in a fishbone pattern; the central rod rotates to drive the plurality of barb corona electrodes to rotate, eddy current is formed in a rotary discharge area through a preset angle formed by the barbs and the axis of the central rod, and the preset angle comprises 30-60 degrees or 120-150 degrees; oil fume particles with the particle size of 2-50 microns in the catering oil fume are negatively charged through point discharge and eddy current of the barb corona electrode; the electrostatic adsorption