Gas purification device and method

The invention belongs to the technical field of flue gas treatment, and particularly relates to a gas purification device and method. The device comprises a gas washing system, a washing liquid electrooxidation system and a washing liquid circulating system, the gas washing system comprises a washing tower, a demister and a circulating tank; the washing liquid electrooxidation system comprises an oxidation tank; an anode plate and a cathode plate are arranged in a tank body of the oxidation tank; liquid supply pipelines are arranged at the upper parts of the side surfaces of the anode plate and the cathode plate; a gas supply pipeline is arranged at the bottom of the tank body of the oxidation tank; and the washing liquid circulating system comprises a middle buffer tank and a circulating pump. According to the gas purification device and method, the washing liquid which is effective in removing SO2 and nitric oxide is completely prepared on line and can be produced at any time when used, the operation cost i