Abstract: Sintering is the process that emits the most pollutants in the iron and steel industry. As people have higher and higher requirements for environmental quality, under the background of strengthening the control of other pollutants in sintering, the issue of CO emissions from sintering of iron ore powder has been widely concerned. CO emission reduction is imperative. The efficient treatment technology for CO emission reduction in sintered flue gas is relatively scarce and cannot meet the CO reduction of sintering machines in the steel industry. This article mainly summarizes the research status and trends of CO emission reduction technology in sintering flue gas at home and abroad, analyzes the mechanism of CO production during sintering process, and discusses CO emission reduction from the three aspects of source, process and end governance.