Photocatalysis　offers　a　sustainable　paradigm　for　solar-to-fuel　conversion　because　it　conflates　the　merits　of　renewable　solar　energy　and　reusable　catalysts.　However,　the　seek　for　robust　photocatalysts　that　can　utilize　the　full　visible　light　spectrum　remains　challenging.　Herein,　cobalt　quantum　dots　(Co　QDs)　were　integrated　into　ultra-narrow　bandgap　dioxin　linked　covalent　organic　frameworks　(COF-318)　for　photocatalytic　solar-to-fuel　conversion　under　full　spectrum　of　visible　light　irradiation.　The　optimal　Co10-COF　exhibited　superior　photocatalytic　CO2　reduction　performance,　affording　a　CO　yield　of　4232　µmolg−1h−1　and　H2　evolution　of　6611　µmolg−1h−1.　Specifically,　Co　QDs　played　a　crucial　role　in　boosting　the　photocatalytic　performance,　which　acted　as　electron　collectors　to　capture　the　photoinduced　electrons　and　then　conveyed　them　to　CO2　molecules.　Moreover,　the　Co　QDs　modification　significantly　improved　the　CO2　adsorption　and　activation　capacity,　as　well　as　prolonging　the　lifetime　of　photogenerated　carriers.　This　work　reveals　an　operable　pathway　for　fabricating　promising　photocatalyst　for　visible-light-driven　solar-to-fuel　generation　and　provides　insight　into　the　impact　of　the　integration　of　Co　QDs　on　COF-based　photocatalysts.　©　2022　Elsevier　Inc.