A　facile,　one-step　clean　strategy　has　been　utilized　for　anchoring　noble　metal　(Au,　Ag,　Pd)　nanoparticles　onto　the　flat　surface　of　two-dimensional　(2D)　graphene　oxide　(GO)　nanosheets.　Without　using　any　additional　reductants,　surfactants　or　protecting　ligands,　the　deposition　of　metallic　noble　metal　(Au,　Ag,　Pd)　nanoparticles　on　the　partially　reduced　graphene　oxide　(PRGO)　mat　has　been　realized　by　a　simple　redox　reaction　between　the　noble　metal　precursors　and　GO　in　an　aqueous　solution.　The　main　size　distributions　of　the　Au,　Ag　and　Pd　particles　are　centered　on　1-20　nm,　3-10　nm　and　0.5-3　nm,　respectively.　The　as-obtained　Au,　Ag　and　Pd-PRGO　nanocomposites　display　superb　catalytic　activities　for　the　selective　reduction　of　nitroaromatic　compounds　into　the　corresponding　amino　compounds　under　ambient　conditions.　The　rates　of　reduction　follow　the　sequence,　Pd-PRGO　＞　Ag-PRGO　＞　Au-PRGO,　suggesting　that　the　smallest　noble　metal　particles　size　affords　the　highest　catalytic　activity.　In　addition,　considering　that　the　Au,　Ag　and　Pd-PRGO　nanocomposites　still　hold　the　abundant　functional　groups　of　the　original　GO,　these　noble　metal-PRGO　composites　maintain　the　excellent　hydrophilic　nature　of　GO,　which　provides　a　flexible　platform　for　the　further　fabrication　of　PRGO-metal-based　multicomponent　functional　materials　by　a　wet-chemistry　approach.