Wet desulfurization system and method for blast furnace gas

The invention provides a wet desulfurization system and method for blast furnace gas. The system comprises an autocatalytic hydrolysis device; the autocatalytic hydrolysis device is provided with a reaction cavity, a gas inlet, a gas outlet, a liquid outlet, a rotary packed bed layer part and a first spraying part; the rotary packed bed layer part comprises a packed bed layer and a rotating part for driving the packed bed layer to rotate which are connected with each other; wherein the packed bed layer and the first spraying part are arranged in the reaction cavity, a gas inlet of the self-catalytic hydrolysis device is communicated with the reaction cavity, the arrangement position of the gas inlet of the self-catalytic hydrolysis device is lower than that of the packed bed layer, and the first spraying part is arranged above the packed bed layer, so that liquid sprayed from the first spraying part can be sprayed onto the packed bed layer; a gas outlet of the autocatalytic hydrolysis device is formed in the