The main methods of waste heat recovery applied in the sintering industry are annular cooling machine + waste heat boiler and vertical cooling + waste heat boiler. The two stage cooling technology of changing the original sintering feed chute to a single-stage vertical cooling can significantly recover high-quality waste heat. On the basis of introducing the process and principle of sintering two-stage cooling technology, this article compares the flow field and temperature distribution of sintering two-stage cooling with traditional ring cooling machine through FLUENT fluid simulation. The advantages of sintering two-stage cooling technology are systematically explained from four aspects: cooling efficiency improvement, waste heat recovery increment, sintering ore production increase, and dust removal efficiency improvement. The results show that this technology can reduce the cooling air volume of ring cooling machine by about 13%, increase the superheated steam temperature by 50 ℃, and reduce the return rate by 1%. The successful application of this technology in the 360 m² sintering machine of Xiangtan Iron and Steel has shown that the steam production of the waste heat boiler has increased from about 34 t/h to about 40 t/h, increasing the power generation of about 1 200 kW, and the annual economic benefit of about 4 million yuan.