Coking wastewater comprising a lot of ammonia is a good desulfurizer for recycling. Sintering flue gas is characterized by large volume, low sulfur dioxide (SO2) concentration and large variation amplitude and etc. The purpose for treating waste with waste can be carried out by treating sintering flue gas with coking wastewater. This paper uses a spray tower countercurrent device, ensures the contact between coking wastewater and sintering flue gas, and detects SO2 concentration of inlet flue gas and outlet flue gas on line by using an automatic flue gas detection instrument. This paper studies on the change regularity for the SO2 concentration at outlet flue gas during the process of treating sintering flue gas with coking wastewater, the influence of SO2 initial concentration in sintering flue gas to the removal efficiency of SO2, the influence of gas-liquid ratio between the sintering flue gas and the coking wastewater to the removal efficiency of SO2, and the change regularity for the pH value of coking wastewater after desulfurizing. The results show that the sintering flue gas which is treated can live up to the atmospheric pollutant effluent standard of iron and steel industry; the pH value of coking wastewater is reduced after treating, and the conditions for the implementation of subsequent coking wastewater treatment process are provided.