Cobalt　phosphide　(CoP)　has　been　demonstrated　as　a　cocatalyst　for　visible-light-sensitized　CO2　reduction,　but　just　with　moderate　selectivity,　due　to　the　competitive　H-2　generation　reaction.　Herein,　the　porous　N-doped　carbon　(NC)　layer　is　in　situ　coated　on　the　surface　of　CoP　nanoparticles　to　fabricate　the　core-shell　CoP@NC　composite　cocatalyst.　Benefiting　from　the　outstanding　electric　conductivity　and　high　surface　area　of　the　NC　shell,　the　CoP@NC　hybrid　attains　strengthened　capabilities　for　charge　separation/transfer　and　CO2　capture/activation.　Besides,　the　direct　contact　of　CoP　with　H2O　is　prevented　by　the　porous　NC　shell　with　high　hydrophobicity.　Consequently,　the　photosensitized　CO2-to-CO　conversion　efficiency　and　selectivity　of　CoP@NC　hybrid　are　enhanced　by　2.7　and　2.4　times,　respectively,　compared　to　bare　CoP.