The excessive emission of carbon monoxide (CO) from steel sintering flue gas poses asignificant threat to regional air quality and human health. This necessitates the development ofeffective CO treatment technologies for sintering flue gas. Among these, catalytic oxidation technologyhas emerged as a stable and efficient method for CO removal. Noble metal-loaded catalysts, includingthose based on platinum (Pt), palladium (Pd), gold (Au), ruthenium (Ru), and iridium (Ir), areconsidered to have significant application potential due to their excellent low-temperature oxidationperformance and resistance to water and sulfur. However, challenges arise from the scarcity and highcost of noble metals, as well as the complex composition of flue gases. These factors complicate theapplication of noble metal-loaded catalysts in industrial settings, highlighting the importance of researchfocused on CO oxidation. The activity of noble catalysts is primarily influenced by theirphysicochemical properties, including morphology, particle size, elemental doping, support type,oxygen vacancies, and surface hydroxyl groups. It has been observed that a moderate amount of HOcan enhance CO oxidation on these catalysts, while excessive HO can inhibit the reaction due toEnergy Environmental Protectioncompetitive adsorption effects. Additionally, the presence of SO in the flue gas can lead to itsadsorption on noble metal active sites or the support, further diminishing the adsorption efficiency ofCO and O and causing carrier sulfation. The CO oxidation reaction on noble metal-loaded catalysts isgoverned by three mechanisms: Langmuir-Hinshelwood (L-H), Mars-van Krevelen (MvK), and Eley-Rideal (ER). HO plays a dual role in these pathways, enhancing CO catalytic oxidation in some caseswhile inhibiting it in others. However, the presence of SO typically reduces the adsorption performanceof CO and O, which can lead to decreased catalyst activity or even deactivation. Given the emissioncharacteristics of sintering flue gas, future research on noble metal-supported catalysts should focus onthree aspects. (1) Improving stability and anti-poisoning performance: Even after desulfurization,sintering flue gas contains residual SO, necessitating catalysts that can withstand such conditions;(2) Investigating activity in complex pollutant environments: Research should explore the activity ofnoble metal-based catalysts in the presence of various pollutants, including SO, heavy metals, alkalimetal dust, and chlorine-containing VOCs; (3) Reducing noble metal loading: Given the high flow ratesof sintering flue gas, it is crucial to develop strategies that minimize noble metal usage whilemaintaining effective CO treatment. This paper aims to provide guidance for the development andoptimization design of CO noble metal supported catalysts for sintering flue gas.