The　photocatalytic　CO2　reduction　to　chemical　feedstocks　represents　a　promising　route　for　the　utilization　of　stranded　renewable　resources,　but　faces　poor　activity　and　selectivity　resulting　from　the　fast　recombination　of　photogenerated　charge　carriers　and　competing　hydrogen　(H-2)　evolution　reaction.　Herein,　we　report　the　synthesis　of　core-shell　structured　Pt/SiO2@SiO2　composites　via　electrostatic　self-assembly　and　surface　SiO2　coating　for　photocatalytic　CO2　reduction　with　Ru(bpy)(3)(2+)　(abbreviated　as　Ru,　bpy　=　2＇2-bipyridine)　as　photosensitizer　and　Pt　as　cocatalyst　under　visible　light　irradiation　(lambda　＞　420　nm).　Photoluminescence　results　illustrate　that　Pt　cocatalyst　enhances　the　transfer　of　photogenerated　electrons　from　the　excited　Ru,　thereby　improving　photocatalytic　performance.　Further　surface　coating　SiO2　prevents　Pt　from　directly　contacting　with　H2O　and　ameliorates　CO2　adsorption　ability　of　catalyst,　thus　suppressing　H-2　evolution　and　increasing　CO　selectivity,　which　also　endows　the　catalyst　with　enhanced　stability.　This　work　would　provide　an　instructive　guideline　in　regulating　the　selectivity　and　stability　of　using　transition　metal　complexes　as　photosensitizers　for　photocatalytic　CO2　reduction　through　the　cocatalyst　loading　and　surface　coating　strategy.