The invention relates to a coal gas purification method and mainly overcomes a technical problem that cooling pipelines of compressors are liable to be blocked and sulfur dioxide emission is excessivebecause sulfides, tar, benzene and naphthalene are not thoroughly removed in coke oven gas purification in the prior art. The problem is solved well by adopting a technical scheme, wherein the methodincludes a) feeding coal gas from a coking plant into a crude debenzolization unit to form a stream I; b) feeding the stream I into an integrated purification column so that aromatic hydrocarbons andsulfides in the gas are adsorbed and a stream II is formed; and c) feeding the stream II into a compressor, compressing the stream II, and conveying the stream II to a gas turbine for power generation. The method can be applied in industrial production of power generation with coke oven gas.