The invention relates to a method and an apparatus for removing hydrogen sulfide through chlorine gas aqueous solution photolysis induction free radical. According to the present invention, hydrogen sulfide-containing flue gas from an industrial device enters a light radiation adsorption washing bed from a flue gas inlet and contacts active carbon fibers on an adsorption reaction column, chlorine gas is sprayed into water from a chlorine inlet through a chlorine gas aeration pipe to form a hypochlorous acid solution, the hypochlorous acid can be attached on the surface of the active carbon fibers through the rotary immersion of the adsorption reaction column into the solution, the surface of the active carbon fibers on the adsorption reaction column can produce high-activity chlorine atoms and high-activity hydroxyl groups due to the decomposition of the hypochlorous acid under ultraviolet light radiation, the hydrogen sulfide in the flue gas and the hydroxyl groups can be subjected to an oxidation reaction on the surface of the active carbon fibers on the adsorption reaction column and the hydrogen sulfide can be fixed on the surface of the active carbon fibers, and when the adsorption reaction column continuously rotates and is re-immersed in the solution, the oxidation product adsorbed on the adsorption reaction column can shed and enter the solution due to ultrasonic oscillation so as to complete the continuous removal and washing process.