A　low-cost　modified　red　mud　supported　Pt　catalyst　was　prepared　by　impregnation　method,　and　the　effect　of　Pt　content　on　catalytic　oxidation　activity　of　toluene　on　Pt/MRM　catalyst　was　investigated.　0.4Pt/MRM　showed　the　best　catalytic　activity,　and　the　toluene　conversion　rate　reached　100%　at　230℃.　The　catalytic　activity　of　0.4Pt/MRM　was　still　higher　when　the　airspeed　was　up　to　120000h-1.　Toluene　can　be　oxidized　effectively　in　a　wide　range　of　toluene　concentrations.　XRD,　FT-IR,　BET,　H2-TPR　and　O2-TPD　were　used　to　characterize.　The　specific　surface　area　of　MRM　was　significantly　higher　than　RM,　which　can　disperse　the　active　component　Pt　better　and　become　a　suitable　catalyst　carrier　for　the　active　component　Pt.　The　prepared　xPt/MRM　catalyst　had　high　surface　area　and　good　pore　structure.　The　interaction　between　Fe2O3　and　Pt　species　in　the　modified　red　mud　increased　the　total　oxygen　desorption　capacity　of　the　catalyst,　improved　the　mobility　of　oxygen　on　the　catalyst　surface,　and　the　catalytic　efficiency.　©　2024　Chinese　Society　for　Environmental　Sciences.　All　rights　reserved.