The utility model discloses a flue gas purification system. This flue gas purification system includes flue gas pipeline, absorbent circulation pipeline and two at least reactors, flue gas pipeline has flue gas house steward and two the at least flue gas branch pipes that meet, absorbent circulation pipeline's inlet and absorbent thick liquid pond are linked together, reactor upper portion sets upflue gas entry and absorbent entry, the flue gas entry and the export of a flue gas branch pipe of reactor are met, absorbent entry and absorbent circulation pipeline's liquid outlet is linked together. Utilize this flue gas purification system, can adjust flue gas purification system's throughput, and then make flue gas purification system have stronger adaptability, reduce the equipment input cost and the operation cost of gas cleaning reaction system. In addition, to the industrial equipment of different emissions, make up the differential response ware of having set for throughput, can match the flue gas purification system of corresponding industrial equipment emission, improve flue gas purification system's manufacturing efficiency.