The utility model relates to a system for advanced treatment and utilization of flue gas desulfurization wastewater. The system comprises a wastewater collection tank, an inclined plate sedimentationtank, an integrated clarification tank, a middle water tank, a multi-medium filter, an ultrafilter, a clear water tank, a DTRO device, a reuse water tank and a strong brine tank. Wherein the wastewater collection tank is connected to the inclined plate sedimentation tank through the water pump, the inclined plate sedimentation tank is connected to the integrated clarification tank through the water pump, the integrated clarification tank is connected with the intermediate water tank, the intermediate water tank is connected to the multi-medium filter through the water pump, and the multi-medium filter is connected to the DTRO device sequentially through the ultrafilter, the clear water tank and the water pump. The DTRO device is provided with a concentrated water outlet and a produced water outlet, the concentrated water outlet is connected to the strong brine tank, and the produced water outlet is connected to the reuse water tank. The device is used for deeply treating the flue gas desulfurization wastewater, fully recycling water resources, reducing the waste of the water resources and improving the comprehensive resource recycling value of desulfurization wastewater treatment.