The utility model discloses a catalytic oxidation agitated reactor for tail gas desulfurization, including the cauldron body and the aeration equipment of setting in cauldron body bottom to and follow cauldron body top and stretch into the agitating unit bottom the cauldron body, said agitating unit top is connected with the motor, physically is provided with catalyst inlet port in upper portion at the cauldron, said agitating unit adopts turbine formula agitating unit, including the (mixing) shaft with set up at the paddle of (mixing) shaft lower part, set up the speed reducer on the (mixing) shaft top, the speed reducer is connected with the motor, agitating unit coincides with the central line of the cauldron body, the (mixing) shaft bottom is provided with the stirring is supported, between (mixing) shaft and the cauldron body open-top is provided with mechanical seal, aeration equipment includes aeration pipe and the aeration hole of seting up on the aeration pipe, be provided with the support on the aeration pipe. The utility model has the advantages that: have react at a slow speed, the mass transfer height of oxygen, gas, solid, liquid three-phase reaction, the crystallization granule is good, operating repair is convenient characteristics.