The invention discloses a method for reducing a catalytic cracking gasoline sulfur content. The method comprises: first conducting cutting separation on catalytic cracking stable gasoline in a pre-fractionation tower so as to obtain light fraction and heavy fraction; delivering the light fraction to an alkali-free deodorization unit; introducing the light fraction subjected to alkali-free deodorization and the hot diesel oil extracted from a catalytic cracking main fractionating tower lateral line into a fractionating tower, thus obtaining light gasoline at the tower top and medium gasoline fraction extracted from a tower middle lateral line, mixing the medium gasoline fraction with the heavy fraction, then subjecting the mixture to selective hydrodesulfurization, and mixing the obtained refined product with the deodorized light gasoline so as to obtain a clean gasoline product or a blending component. The method disclosed in the invention not only can decrease the content of mercaptan sulfur and total sulfur in the catalytic cracking gasoline, produce clean gasoline products with qualified sulfur and olefin content, but also can substantially reduce the production equipment energy consumption and increase the economic benefits of catalytic cracking gasoline desulfurization equipment.