Single-atom　catalysts　(SACs)　have　emerged　as　an　advanced　frontier　in　heterogeneous　catalysis　due　to　their　potential　to　maximize　the　atomic　efficiency.　Herein,　covalent　triazine-based　frameworks　(CTFs)　confining　cobalt　single　atoms　(Co-SA/CTF)　photocatalysts　have　been　synthesized　and　used　for　efficient　CO2　reduction　and　hydrogen　production　under　visible　light　irradiation.　The　resulted　Co-SA/CTF　demonstrate　excellent　photocatalytic　activity,　with　the　CO　and　H2　evolution　rates　reaching　1665.74　µmol　g　−1　h　−1　and　1293.18　µmol　g　−1　h　−1,　respectively,　far　surpassing　those　of　Co　nanoparticles　anchored　CTF　and　pure　CTF.　A　variety　of　instrumental　analyses　collectively　indicated　that　Co　single　atoms　sites　served　as　the　reaction　center　for　activating　the　adsorbed　CO2　molecules,　which　significantly　improved　the　CO2　reduction　performance.　Additionally,　the　introduction　of　Co　single　atoms　could　accelerate　the　separation/transfer　of　photogenerated　charge　carriers,　thus　boosting　the　photocatalytic　performance.　This　study　envisions　a　novel　strategy　for　designing　efficient　photocatalysts　for　energy　conversion　and　showcases　the　application　of　CTFs　as　attractive　support　for　confining　metal　single　atoms.　©　2022