Supported　Pt　catalysts　often　exhibit　limited　effectiveness　in　achieving　complete　methane　oxidation,　which　restricts　their　commercial　application.　However,　Pt　catalysts　are　particularly　attractive,　especially　in　sulfur-containing　environments,　where　commercial　Pd　catalysts　are　more　susceptible　to　sulfur　poisoning.　Therefore,　developing　highly　active　Pt　sites　and　gaining　a　deeper　understanding　of　the　intrinsic　mechanisms　governing　methane　combustion　over　Pt　catalysts　is　essential.　In　this　study,　we　present　a　highly　active　stannic　oxide　supported　platinum　catalyst　(Pt/SnO2)　for　stable　low-temperature　methane　combustion,　achieving　a　T90　as　low　as　390　°C　at　a　high　gas　hourly　space　velocity　(GHSV)　of　60,000　mL·gcat-1·h-1.　This　performance　surpasses　that　of　most　other　Pt　catalysts　as　well　as　Pd/SnO2　and　benchmark　Pd/Al2O3.　The　superior　SO2　tolerance　of　Pt/SnO2　was　demonstrated　by　the　stability　of　methane　conversion　at　500　°C,　with　only　a　minor　reduction　observed　during　the　long-term　online　test.　Characterization　results　indicate　that　the　Pt　atoms　on　SnO2　are　electron-deficient　and　predominantly　adopt　a　crowded　configuration.　In　situ　studies　and　density　functional　theory　(DFT)　calculations　reveal　that　the　electron-deficient,　crowded　Pt　atoms　enhance　the　chemisorption　of　CH4　molecules　by　withdrawing　the　electrons　from　CH4,　resulting　in　activated　CH4　with　an　elongated　C-H　bond.　This　work　provides　an　in-depth　understanding　of　the　nature　of　Pt　active　sites　for　high-performance　methane　combustion,　offering　valuable　insights　for　the　rational　design　of　Pt-based　catalysts.　©　2025　American　Chemical　Society.