Covalent　triazine-based　frameworks　(CTFs)　with　a　graphene-like　layered　morphology　have　been　controllably　synthesized　by　the　trifluoromethanesulfonic　acid-catalyzed　nitrile　trimerization　reactions　at　room　temperature　via　selecting　different　monomers.　Platinum　nanoparticles　are　well　dispersed　in　CTF-T1,　which　is　ascribed　to　the　synergistic　effects　of　the　coordination　of　triazine　moieties　and　the　nanoscale　confinement　effect　of　CTFs.　CTF-T1　exhibits　excellent　photocatalytic　activity　and　stability　for　H2　evolution　in　the　presence　of　platinum　under　visible　light　irradiation　(λ　≥　420　nm).　The　activity　and　stability　of　CTF-T1　are　comparable　to　those　of　g-C3N4.　Importantly,　as　a　result　of　the　tailorable　electronic　and　spatial　structures　of　CTFs　that　can　be　achieved　through　the　judicial　selection　of　monomers,　CTFs　not　only　show　great　potential　as　organic　semiconductor　for　photocatalysis　but　also　may　provide　a　molecular-level　understanding　of　the　inherent　heterogeneous　photocatalysis.　A　covalent　triazine-based　framework　possessing　a　graphene-like　layered　morphology　shows　excellent　photocatalytic　activity　and　stability　in　splitting　water　under　visible　light　irradiation.　The　superior　recyclability　results　from　the　good　stabilization　of　metal　NPs,　which　is　ascribed　to　the　synergetic　effects　of　the　coordination　of　triazine　to　metal　atom　and　the　confinement　effect　of　frameworks.　©　2015　Wiley-VCH　Verlag　GmbH　and　Co.　KGaA,　Weinheim.