Photocatalytic　H2productionviawater　splitting　has　emerged　as　an　eco-friendly　and　green　technology　to　efficiently　utilize　solar　energy.　Developing　visible　light　active　photocatalysts,　especially　the　metal-free　ones,　is　crucial　to　access　this　technology　considering　their　economic　and　environmental　benefits.　Hence,　a　facile　UV　reduction　method　was　adopted　to　fabricate　a　highly　active　metal-free　photocatalyst　by　modifying　covalent　triazine-based　frameworks　(CTFs)　with　reduced　graphene　oxide　(rGO).　The　optimized　CTF　composite　with　2　wt%　rGO　exhibited　a　4.3-fold　activity　enhancement　compared　with　pristine　CTFs,　showing　a　prime　H2evolution　efficiency　of　894　μmol　g−1h−1.　The　contributions　of　rGO　to　the　photocatalytic　system　and　the　interaction　between　rGO　and　CTFs　were　thoroughly　studied.　The　modification　of　rGO　endowed　the　photocatalyst　with　improved　visible-light　absorption,　stronger　reductive　ability,　and　faster　separation　rate　of　photoinduced　carriers.　Moreover,　the　covalent　C-O-C　bond　formed　in　the　two　components　facilitates　the　directional　transfer　of　photoinduced　electrons.　A　low-cost　and　robust　photocatalyst　for　clean　energy　production　is　constructed　in　this　work,　providing　inspirations　for　the　design　and　fabrication　of　metal-free　photocatalytic　materials　with　superior　performance.　©　The　Royal　Society　of　Chemistry　2021.