The invention discloses a wet purification apparatus for coke oven gas, comprising a primary cooling column, an electric tar precipitator, a precooling column, an ammonia remover, a desulfurizing column, a final cooling column, and a benzol scrubber that are in successively connection with a coke oven gas pipe. The benzol scrubber is provided with a purified gas outlet, and a regenerating column which provides a desulfurizing liquid is connected to the desulfurizing column. A purification process implemented by the apparatus includes the steps: after cooling, tar removal and ammonia removal, feeding the coke oven gas to the desulfurizing column, sprinkling in the desulfurizing column the desulfurizing liquid from the regenerating column, and after acidic gases in the ammonia-remove coal gas such as H2S, HCN and CO2 are absorbed by the desulfurizing liquid, cooling and removing benzol to obtain purified coal gas. The purified coal gas is directly applicable to urban civil use, metallurgical use and the like, and the desulfurizing rate is up to 98 %.