Photo-to-chemical　energy　conversion　requires　a　systematic　and　complex　molecular　design　to　manage　consecutive　photochemical　processes,　including　energy　harvesting,　exciton　migration,　electron　transfer,　charge　separation,　and　charge　transport.　However,　such　an　integrated　design　remains　a　substantial　challenge.　Here,　we　report　a　seamless　system　in　managing　these　photochemical　events　on　the　basis　of　two-dimensional　sp(2)　carbon-conjugated　covalent　organic　frameworks.　The　frameworks　are　designed　to　be　fully　pi　conjugated　for　harvesting　a　wide　range　of　visible　to　near-infrared　light　and　to　constitute　built-in　donor-acceptor　heterojunction　interfaces　for　splitting　excitons.　The　frameworks　create　dense　yet　ordered　columnar　pi　arrays　that　offer　pathways　to　facilitate　exciton　migration　and　charge　transport.　Loading　reaction　centers　in　pores　or　on　surface　shortens　the　electron-transfer　distance　and　promotes　the　accumulation　of　electrons　at　the　reaction　centers.　These　three　molecular　mechanisms　are　seamlessly　integrated　in　the　frameworks　and　render　the　system　able　to　efficiently　produce　hydrogen　that　is　driven　by　low-energy　photons.