The　Pd-Co-Ti　catalyst　was　successfully　prepared　by　the　method　of　impregnation-precipitation-ball　milling.　The　structure　and　redox　properties　of　Pd-Co-Ti　catalyst　was　investigated　by　N2　desorption,　X-ray　powder　diffraction　(XRD),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS)　and　H2-TPR.　The　results　show　that　the　Pd-Co-Ti　catalyst　has　a　large　specific　surface　area　and　a　rich　pore　structure,　and　there　are　Co3O4　and　anatase　TiO2　crystals　in　the　catalyst.　The　synergistic　effect　of　Pd　and　Co　improves　the　redox　ability　of　Pd-Co-Ti　catalyst.　The　catalyst　is　used　to　treat　CO　in　the　flue　gas　of　rolling　mills.　It　runs　for　168　hours　at　a　space　velocity　of　30,000　cm3/(g·h)　and　a　temperature　of　280◦C,　and　the　CO　removal　rate　is　basically　maintained　at　more　than　90%.　The　ratio　of　inlet　CO　content　and　O2　content　affects　the　catalyst　CO　removal　efficiency.　When　the　ratio　is　greater　than　0.5,　the　CO　removal　efficiency　has　a　downward　trend.　The　results　of　this　study　are　of　great　significance　to　the　practical　application　of　CO　oxidation　technology.　©　2022　River　Publishers