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Constructing heterojunction photocatalytic systems with highly spatial charge separation, strong photoredox ability and rapid surface reaction still remains an enormous challenge. Herein, hollow CoS x polyhedrons decorated hierarchically direct Z-scheme Mn 0.5 Cd 0.5 S/CdWO 4 heterojunction photocatalyst is designed and constructed by a simple sonochemical approach and subsequent in situ deposition route. Such a constructed Mn 0.5 Cd 0.5 S/CdWO 4 /CoS x ternary composite exhibits a significantly boosted photoactivity toward H 2 generation compared to bare Mn 0.5 Cd 0.5 S, binary Mn 0.5 Cd 0.5 S/CdWO 4 , Mn 0.5 Cd 0.5 S/CoS x and Mn 0.5 Cd 0.5 S/Pt samples with optimized composition ratio. Apart from the efficient charge transfer channels and preserved strong photoredox ability within the direct Z-scheme Mn 0.5 Cd 0.5 S/CdWO 4 heterojunction, the hollow structure of CoS x polyhedrons could endow abundant surface-active sites, strengthen the light-harvesting capacity through the internal multilight scattering/reflection and decrease the overpotential for H 2 evolution, which further contributes to the boosted photoactivity toward hydrogen production. This study demonstrates an alternate methodology for constructing high-performance multi-hierarchical Z-scheme/cocatalyst heterojunction photocatalysts for solar energy conversion. [ABSTRACT FROM AUTHOR]