The invention discloses a desulfurizing tower system with an oxidation device of an improved structure, and belongs to the technical field of desulfurization. A fume inlet is formed in the middle of a desulfurizing tower; a fume outlet is formed in the top of the desulfurizing tower; a demisting section, an absorbing section, a cooling section and an oxidation tank are sequentially arranged from top to bottom inside the desulfurizing tower; the demisting section is arranged below the fume outlet; the cooling section is arranged below the absorbing section in a position corresponding to the fume inlet; the oxidation tank is arranged at the bottom of the desulfurizing tower and is filled with a circulation absorption mixed liquid; an air distributor and a multi-layer gas-liquid distributor are arranged inside the oxidation tank. By adoption of the desulfurizing tower system, the gas-liquid contact area is greatly increased, and the reaction efficiency is improved. According to the desulfurizing tower system with the oxidation device of the improved structure, the oxidation efficiency of ammonium sulfite is up to 99%.