The utility model belongs to the technical field of the tail gas desulfurization technique, a tail gas desulfurization is with regeneration reation kettle is disclosed for there is the material in the current reation kettle of solution and is mixing the problem inhomogeneous, that the crystallization granule is little. The utility model discloses a skid -mounted seat, be provided with reation kettle and barrel on the skid -mounted seat, reation kettle's mounted position is higher than the mounted position of barrel, be provided with centrifuge in the barrel, reation kettle includes the cauldron body, the upper end of the cauldron body is provided with quick lime charge door and exhaust hole, the upper end of the cauldron body is provided with driving motor, driving motor's output shaft has the (mixing) shaft, it is internal and mutually support in the internal stirring support of cauldron with the setting that the (mixing) shaft stretches into the cauldron, the bottom of the cauldron body is provided with row cinder notch, arrange cinder notch management way and barrel intercommunication, still be provided with the overflow mouth on the cauldron body, be connected with multilayer stirring vane on the (mixing) shaft, the bottom of the cauldron body still is provided with the gas blow pipe, the gas blow pipe is manage and is said that the compressed air source with outside communicates.