The invention discloses a waste gas treatment device. The waste gas treatment device comprises a connecting pipeline, wherein the connecting pipe is connected from a boiler and is sequentially connected with a first filtering bin, a collecting bin, a combusting bin, a second filtering bin and a drainage passage, wherein a plurality of layers of filtering net screens are arranged in the first filtering bin; the second filtering bin is a water tank, and a plurality of filtering nets are arranged in the water tank; a plurality of layers of activated carbon are arranged at the inner wall of the drainage passage. The waste gas treatment device provided by the invention has the advantages that by adopting the filtering, combusting and refiltering type, most of pollutant sources in the waste gas are removed, and the problem of pollution of waste gas to environment is greatly relieved; the treatment cost of the waste gas treatment device is not high, and the requirement of enterprise factories is met.