The　cubic　In(OH)(3)/ZnIn2S4　heterostructures　were　successfully　synthesized　via　a　simple　strategy　of　post-treatment　of　cubic　ZnIn2S4　(C-ZIS),　and　their　structures　and　properties　were　characterized　by　X-ray　diffraction　(XRD),　UV-vis　diffuse　reflectance　spectra　(DRS),　field　emission　scanning　electron　microscopy　(FESEM)　and　transmission　electron　microscopy　(TEM).　According　to　the　results,　the　tofu-like　In(OH)(3)　semiconductor　as　a　new　crystal　phase　appeared　in　the　matrix　of　C-ZIS　and　formed　a　In(OH)(3)/ZnIn2S4　heterostructure.　Compared　with　pure　C-ZIS,　the　heterostructure　exhibits　higher　photocatalytic　activity　towards　selective　oxidation　of　benzyl　alcohol　under　visible　light.　The　In(OH)(3)　/ZnIn2S4　heterostructure　manifests　the　best　and　the　highest　photocatalytic　performance　via　18　h　post-treatment,　which　achieved　nearly　100%　selectivity,　35.5%　conversion　and　34.5%　yield.　This　is　ascribed　to　the　formation　of　In(OH)(3)/ZnIn2S4　heterostructure　to　promote　the　transfer　of　photogenerated　electron-hole　pairs　and　thus　efficiently　inhibits　their　recombination,　leading　to　the　longer　lifetime　of　photo-induced　carriers.　Furthermore,　a　possible　photocatalytic　mechanism　is　proposed　and　discussed.　Our　current　work　could　boost　more　interest　in　researching　the　semiconductor　materials　of　ternary　chalcogenides　and　enlarging　the　applications　based　on　cubic　ZnIn2S4　heterostructure　as　visible-light-driven　photocatalyst.