Photoreduction　of　[PtCl6](2-)　over　hexagonal　ZnIn2S4　led　to　the　formation　of　surface　deposited　small　PtS　nanoparticles　with　a　size　of　ca.　3　nm.　The　resultant　PtS/ZnIn2S4　nanocomposites　were　fully　characterized　and　their　performance　for　photocatalytic　splitting　of　thiols　to　produce　disulfides　and　hydrogen　was　investigated.　It　was　found　that　PtS　significantly　promoted　the　photocatalytic　performance　for　thiols　splitting　to　produce　disulfides　and　quantitative　hydrogen　over　ZnIn2S4　under　visible　light　and　no　over-oxidized　products　of　thiols　were　produced.　An　optimum　performance　was　observed　over　0.5　wt%　PtS/ZnIn2S4,　with　a　complete　transformation　of　thiols　to　disulfides　in　6　h.　PtS/ZnIn2S4　nanocomposite　is　stable　during　the　photocatalytic　reaction　and　can　be　easily　separated　for　recycling.　The　photocatalytic　thiols　splitting　over　PtS/ZnIn2S4　is　an　efficient　and　cost　effective　strategy　to　produce　disulfides,　which　exhibits　100%　atom　economy　since　hydrogen　is　generated　concomitantly.　This　study　demonstrates　that　the　coupling　of　water　reduction　with　organics　oxidation　over　semiconductor-based　photocatalysts　may　find　great　potentials　in　organic　syntheses.