CdS　quantum　dots　(QDs)　are　excellent　visible-light-driven　photocatalysts　due　to　their　unique　small　size　(＜10　nm),　suitable　band　energy　structure,　and　short　charge　transportation　length.　Unfortunately,　the　easy　aggregation　of　CdS　QDs　to　form　larger　particles　results　in　a　higher　recombination　rate　for　photoinduced　electron-hole　pairs,　which　deteriorates　the　photocatalytic　activity.　Here,　we　report　in　situ　growth　of　CdS　QDs　with　high　dispersion　and　stability　on　covalent　triazine-based　frameworks　(CTFs)　via　a　facile　photoreduction　method.　The　photocatalytic　H-2　evolution　activity　of　CdS　QD-loaded　CTFs　is　effectively　enhanced　to　approximately　55　and　4　times　than　that　of　pristine　CTFs　and　bulk　CdS,　respectively.　This　enhanced　photocatalytic　performance　is　mainly　ascribed　to　the　higher　separation　rate　of　photogenerated　carriers　resulting　from　synergistic　QD-on-sheet　interactions　between　CdS　QDs　and　CTFs.　This　work　develops　an　efficient　one-pot　strategy　to　prepare　metal-sulfide　QDs　with　high　dispersion　and　underlines　the　potential　of　utilizing　CTFs　as　a　suitable　platform　to　develop　efficient　photocatalytic　systems.　(c)　2020　Elsevier　B.V.　All　rights　reserved.