A　high　sensitivity,　fast　ultraviolet　(UV)　photodetector　was　fabricated　from　WO3　nanodiscs　(NDs)/reduced　graphene　oxide　(RGO)　composite　material.　The　WO3　NDs/reduced　GO　composite　material　was　synthesized　using　a　facile　three-step　synthesis　procedure.　First,　the　Na2WO4/GO　precursor　was　synthesized　by　homogeneous　precipitation.　Second,　the　Na2WO4/GO　precursor　was　transformed　into　H2WO4/GO　composites　by　acidification.　Finally,　the　H2WO4/GO　composites　were　reduced　to　WO3　NDs/RGO　via　a　hydrothermal　reduction　process.　The　UV　photodetector　showed　a　fast　transient　response　and　high　responsivity,　which　are　attributed　to　the　improved　carrier　transport　and　collection　efficiency　through　graphene.　The　excellent　material　properties　of　the　WO3　NDs/RGO　composite　demonstrated　in　this　work　may　open　up　new　possibilities　for　using　WO3　NDs/RGO　for　future　optoelectronic　applications.