The　solar-driven　reduction　of　carbon　dioxide　(CO2)　using　nonmetal　catalysts　is　an　appealing　solution　to　address　the　current　energy　and　environmental　challenges.　Herein,　we　synthesized　nitrogen-containing　nanocarbons　(NCNs)　with　a　nitrogen　content　of　27.6　atom　%　by　a　photochemical　approach.　We　found　that　this　NCNs　structure　can　act　as　a　catalyst　to　drive　the　reduction　of　CO2　into　carbon　monoxide　(CO).　The　CO　evolution　activity　over　the　NCNs　reached　34.5　mu　mol/30　min　(1　mg　NCN)　with　a　selectivity　of　80.4%.　The　quantum　efficiency　over　the　NCNs　was　2.3%　at　450　nm　irradiation,　which　is　comparable　to　those　of　the　metal-based　catalysts　for　CO2　reduction　under　visible　light　irradiation.　The　reaction　processes　of　CO2　reduction　were　investigated　by　CO2　adsorption,　CO2　temperature-programmed　desorption,　and　in　situ　diffuse　reflectance　infrared　Fourier　transform　spectroscopy.　Results　suggested　that　the　pyridinic　nitrogen　sites　within　NCNs　were　the　main　active　species　for　CO2　reduction　catalysis.　Besides,　we　observed　that　nanocarbons　with　oxygen　modification　can　also　drive　the　CO2　reduction　reaction.　However,　the　promotion　effect　of　the　nitrogen　modification　on　CO2　reduction　was　better　than　that　of　the　oxygen　modification　on　CO2　reduction.　Additionally,　using　this　photochemical　approach,　we　synthesized　different　nanocarbons　by　changing　carbon　precursors,　highlighting　the　versatility　of　this　approach.　This　work　expands　the　application　of　nanocarbon　for　photosynthetic　CO2　conversion.