Device and method for treating organic waste gas

The invention relates to a device and a method for treating organic waste gas. The device includes a pretreatment water-washing reactor and a photocatalytic reactor, an atomizer, a scrubber and a dehydration demister are sequentially arranged in the pretreatment water-washing reactor from bottom to top; a water tank is arranged the bottom of the atomizer, and the top of the atomizer is provided with a plurality of atomizing nozzles; the scrubber includes a plurality of washing layers arranged in parallel; the dehydration demister includes a mesh grid plate arranged at the lower part and a silica gel drying agent spread on the mesh grid plate; and the photocatalytic reactor is a closed box body, a reflective layer is arranged on the inner surface of the box body, the photocatalytic reactorincludes a plurality of transversely arranged photocatalytic columns, and an ultraviolet lamp tube is arranged in the middle of each photocatalytic column. The pretreatment water-washing reactor in the entire organic waste ga