In　this　work,　we　report　a　novel　MoSx/Mn0.3Cd0.7S　composite　catalyst　that　has　been　designed　and　fabricated　by　in　situ　coupling　MoSx　nanoclusters　with　1D　Mn0.3Cd0.7S　nanorods　for　photocatalytic　H2　production.　The　catalyst　features　a　1D　nanostructure　with　MoSx　nanoclusters　uniformly　dispersed　along　the　Mn0.3Cd0.7S　nanorod.　It　was　found　that　an　intimate　interface　is　built　between　MoSx　nanoclusters　and　Mn0.3Cd0.7S　nanorods　thanks　to　the　facile　in　situ　photoreduction　route,　which　contributes　to　a　high-efficiency　interfacial　charge　separation.　The　resulting　MoSx/Mn0.3Cd0.7S　photocatalyst　shows　a　dramatically　enhanced　visible-light-driven　photocatalytic　H2　production　activity　compared　with　the　control　samples,　owing　to　more　efficient　spatial　charge　separation　as　well　as　enriched　active　sites.　This　work　is　expected　to　provide　an　optimized　structure　model　for　rational　design　and　constructing　novel,　inexpensive,　efficient　and　stable　cocatalyst/metal　sulfide　photocatalyst　systems　for　H2　production.　©　2022　Elsevier　Inc.