The gas composition in the temporary storage of kitchen wet garbage, solid waste and hazardous waste is complex, which contains odor acid-base gas and VOC gas, which is harmful to human health and needs to be purified according to the national emission standards. The treatment process of the system: the washing tower adopts acid / alkali washing and water washing integrated tower + photocatalysis + low temperature plasma + activated carbon adsorption for waste gas purification treatment, automatic control, standard discharge, small occupation area, simple and convenient control operation, good treatment effect and low maintenance cost.