Sulfur dioxide absorption tower

The utility model relates to a sulfur dioxide absorption tower, in particular to an absorption tower for absorbing sulfur dioxide generated in the citric acid hydrolysis process. The absorption tower comprises a tower body, wherein a gas outlet is arranged at the top of the tower body; a chemical storage tank is arranged at the bottom end in the tower body; a gas inlet is arranged above the chemical storage tank; an induced draft fan is arranged at the gas outlet; a rotary distributor and a filler layer are arranged above the chemical storage tank in the tower body from top to bottom in sequence; a chemical pipeline is arranged between the rotary distributor and the chemical outlet; the rotary distributor is movably connected with the chemical pipeline; and a circulating pump is arranged on the chemical pipeline. Due to the adoption of the rotary distributor and the filler layer, the contact area of tail gas and a chemical agent is increased, the contact time of the tail gas and the chemical agent is prolonge