The　visible-light-driven　photocatalytic　CO2　reduction　is　one　appealing　approach　to　simultaneously　mitigate　the　energy　crisis　and　environmental　issues.　It　is　highly　desirable　but　challenging　to　selectively　and　efficiently　convert　CO2　into　desirable　products.　Herein,　a　covalent　organic　framework　hosting　metalloporphyrin-based　carbon　dots　(M-PCD@TD-COF,　M　=　Ni,　Co,　and　Fe)　is　first　presented,　which　serves　as　heterogeneous　catalysts　for　CO2　photoreduction.　M-PCD@TD-COF　not　only　enriches　available　COF-based　catalytic　materials,　but　also　provides　suitable　environment　for　CO2　adsorption　and　activation　on　metalloporphyrin-based　carbon　dots.　The　advantages　of　the　host　environment　in　COFs　are　highlighted　by　the　satisfactory　catalytic　activity　and　remarkable　selectivity　of　CO2-to-CO　conversion　over　H2　generation　up　to　98%.　The　photocatalytic　system　is　effective　for　both　pure　CO2　and　the　simulated　flue　gas.　This　work　provides　new　protocols　for　the　rational　design　of　COF-based　heterogeneous　catalysts　for　selective　CO2　photoreduction.　©　2020　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim