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According to the condition of desulfurization, an intelligent control system of efficiency flue gas desulfurization based on PLC has been designed. By monitoring the temperature, flow rate, particle concentration of flue gas pipeline, and the system can obtain the dynamic real-time flow of sulfur dioxide. After analysis the timely output, the control instructions would be issued, the operation of device can be effectively controlled, and the desulfurization can be efficiency improved, the cost of the system can be also reduced. The system takes Siemens S7-226PLC as automation control station, and the computer with monitoring software WinCC is used as the upper computer. Through the actual operation, the desulfurization efficiency of the system is about 96.2%, and the system has good stability and practicality.