The utility model relates to a sulfur dioxide (SO2) degassing tower which is used for removing sulfur dioxide (SO2) in liquid, in particular to a degassing tower which is used for removing the SO2 in acid wastewater during process of smelting gas production SO2, wherein the SO2 is dissolved in the liquid. The SO2 degassing tower is characterized by structurally comprising a lower air intake pipe which is arranged on the side wall of the lower portion of a tower body, an upper air intake pipe which is arranged on the side wall of the middle portion of the tower body, a lower padding supporting plate which is positioned above the lower air intake pipe and in the tower body, an upper padding supporting plate which is positioned above the upper air intake pipe and in the tower body, and a liquid distributor. Padding is arranged on the lower padding supporting plate. The padding is arranged above the upper padding supporting plate and below a liquid inlet distributor. The liquid distributor is arranged above the padding on the lower padding supporting plate and below the upper air intake pipe. The SO2 degassing tower has the advantages of being small in air resistance, high in air-removing efficiency, and environmental, and efficiently recycling the SO2.