Photocatalytic　conversion　of　carbon　dioxide　(CO2)　to　valuable　products　is　one　of　the　promising　approaches　to　mitigate　climate　change　and　provide　chemical　fuels.　The　structural　design　of　photocatalysts　has　been　therefore　directed　to　enhancing　the　CO2　conversion　efficiency　and　selectivity.　Herein,　we　report　that　the　metalated　porous　polycarbazoles,　made　by　facile　one-pot　oxidative　polymerization　and　successive　transition　metal　impregnation,　can　effectively　convert　CO2　into　carbon　monoxide　(CO)　with　high　selectivity　under　visible　light　irradiation.　The　high　porosity　of　the　porous　polycarbazoles　provides　enhanced　CO2　adsorption　and　the　incorporated　metals　facilitate　the　CO2　activation.　The　type　of　metal　ions　influences　the　CO　selectivity　by　altering　surface　reaction　kinetics　for　CO2　reduction.　Our　approach　proves　that　the　photocatalytic　CO2　reduction　ability　and　selectivity　of　porous　conjugated　polymers　can　be　improved　by　decorating　functional　metal　species　to　modulate　the　adsorption　and　activation　behavior　of　CO2　molecules.