In order to solve the problem of resource utilization of waste desulfurizer returned to sintering from gas refining unit of Zhanjiang Iron and Steel, the various physical and chemical properties of waste desulfurizer are studied by chemical composition, XRD and thermogravimetric analysis, and relevant sintering pot tests and industrial production practices are conducted to study the effects of waste desulfurizer on quantity and quality of sintering ore and flue gas emission indices. The results show that the S in the waste desulfurizer mainly exists in the form of monomers, and the Fe exists uniformly in the form of iron sulfide, iron oxide and iron sulfate; the waste desulfurizer is more stable below 135 °C, and above that temperature, crystalline water removal and simple substance S oxidation reaction will occur successively; the waste desulfurizer is premixed with the sintering raw materials and mixed into the blended ore at 0. 01% ~ 0. 10% for production, and the quantity and quality of sinter and flue gas emission can be up-to-standard, and all the waste desulfurizer can be recycled.