The invention provides a regenerating and processing method for activated alumina used in the process of hydrogen peroxide working solution regeneration. The method comprises the following steps: inactivated alumina discharged from a solution regeneration bed in the process of hydrogen peroxide production and alumina inert for burning enter a tower reaction vessel from the upper part of the vessel, and move downwards according to the gravity, the gas containing oxygen enters a reaction vessel from the lower part of the tower reaction vessel and moves upwards; after reaction, the regenerated alumina and the alumina inert for burning are discharged from a material outlet device at the bottom part of the reaction vessel and tail gas is discharged from a tail gas outlet at the upper part of the reaction vessel; and the reaction temperature ranges from 360 to 800 DEG C, and the detention time of solid material in the reactor is 3 to 15 hours. The method of the invention is economical, environment-friendly and safe. In addition, the obtained regenerated alumina has no poisoning risk to the production of catalyst Pd and has low treatment cost, thereby having great value for popularization.