The invention relates to the field of refining of hydrocarbon materials, and discloses a gasoline deep-desulfurization method and a gasoline deep-desulfurization device. The method comprises the following steps: (1) fractionating a gasoline raw material; (2) contacting a light fraction with an alkali solution to carry out alkali solution extraction, oxidizing a sulfur-containing alkali solution toobtain an oxidized sulfur-containing alkali solution, and contacting the oxidized sulfur-containing alkali solution with a hydrocarbon solvent to carry out back extracting treatment; (3) contacting the alkali solution extracted light fraction with an extracting solvent to carry out solvent extraction, and separating the sulfur-containing solvent and sulfides in the sulfur-containing solvent through distillation; (4) contacting a heavy fraction with a hydrodesulfurization catalyst to carry out a selective hydrodesulfurization reaction in order to obtain a hydrogenated heavy fraction; and (5) mixing the hydrogenated heavy fraction with the solvent-extracted light fraction to obtain a gasoline product. The method allows the low-sulfur gasoline product to be obtained on the premise of avoiding great loss of the octane number.