The gas composition of wet kitchen waste is complex, which contains malodorous acid-base gas and VOC gas, which is harmful to human health and needs to be purified according to the national emission standard. System treatment process; The scrubber adopts acid / alkali washing and water washing integrated tower + photocatalysis + low-temperature plasma + activated carbon adsorption for waste gas purification, automatic control, up to standard discharge, small floor area, simple and convenient control operation, good treatment effect and low maintenance cost.