Abstract: Three catalysts 1%Pt/CZLY, 1%Pt/CZLGd and 1%Pt/CZLYGd were prepared by the polyol method. Characterization results showed that the specific surface area of the materials could be effectively increased by the addition of rare-earth gadolinium elements, which promoted the formation of Ce³⁺ species and O_latt. Gadolinium action resulted in smaller and more uniformly dispersed Pt particles. The 1% Pt/CZLYGd catalyst exhibited the most excellent CO catalytic oxidation activity ( T₉₀ = 95 ℃, GHSV = 45000 mL/(g·h)), was able to act continuously for 24 h under the reaction conditions without any decrease in conversion, and showed good resistance to the toxicity of SO₂. The interaction of Gd₂O₃ with other components can help to further increase the number and types of active sites, improve the catalytic efficiency, enhance the thermal and sulfur stability of the catalyst, and extend the service life of the catalyst. This provides a new idea for the development of high sulfur-resistant catalysts for industrial applications.