The　development　of　efficient　photocatalysts　for　hydrogen　evolution　is　pivotal　for　sustainable　energy　conversion.　Herein,　two　novel　covalent　organic　frameworks　(COFs),　COF-TFPPy　and　COF-TAEPy,　were　synthesized　via　Schiff-base　condensation,　distinguished　by　their　C–C　and　C[tbnd]C　bridging　units,　respectively.　Structural　and　photophysical　characterizations　revealed　that　the　alkynyl-bridged　COF-TAEPy　exhibited　enhanced　π-conjugation,　reduced　bandgap,　and　superior　charge　transfer　kinetics　compared　to　COF-TFPPy.　Under　visible　light,　COF-TAEPy　demonstrated　a　remarkable　hydrogen　evolution　rate　of　75.2　mmol　h⁻¹　g⁻¹,　twofold　higher　than　COF-TFPPy　(37.5　mmol　h⁻¹　g⁻¹).　This　performance　stems　from　alkynyl-induced　ultrafast　charge　separation,　prolonged　exciton　lifetimes,　and　minimized　recombination　losses.　Our　findings　highlight　the　critical　role　of　alkynyl　bridges　in　tailoring　COFs　for　high-efficiency　photocatalytic　applications,　providing　a　strategic　blueprint　for　designing　advanced　energy　conversion　materials.　©　2025