A　facile　and　effective　photo-reduction　approach　to　deposit　Pt　nanoparticles　on　MIL-100(Fe)　by　using　a　metal-organic　framework　(MOF)　itself　as　a　photoactive　catalyst　has　been　developed.　The　synthesized　samples　were　characterized　using　X-ray　diffraction　(XRD),　UV-vis　diffuse　reflectance　spectroscopy　(DRS),　X-ray　photoelectron　spectroscopy　(XPS),　transmission　electron　microscopy　(TEM)　and　high-resolution　transmission　electron　microscopy　(HRTEM)　and　determining　N-2-sorption　BET　surface　area.　The　as-obtained　Pt/MIL-100(Fe)　showed　photocatalytic　activity　for　H-2　evolution　under　visible　light　irradiation　and　its　performance　is　superior　to　that　of　Pt/MIL-100(Fe)-NaBH4,　in　which　Pt　was　obtained　via　reduction　by　NaBH4.　This　work　provides　an　effective　and　facile　approach　for　the　preparation　of　metal　nanoparticles/MOF　nanocomposites　and　demonstrates　their　potential　in　solar　energy　transformations.