Grape　seed-coated　nanoscale　zero-valent　iron　(GS-NZVI)　was　synthesized　using　grape　seed　extract　as　the　stabilizing　agent,　and　it　was　used　to　degrade　Reactive　Brilliant　Red　K-2G　(RBR,　azo　dye)　and　Reactive　Brilliant　Blue　KN-R　(RBB　anthraquinone　dye).　The　GS-NZVI　was　characterized　by　scanning　electron　microscopy　(SEM),　X-ray　energy-dispersive　spectrometry　(EDS),　transmission　electron　microscopy　(TEM),　dynamic　light　scattering　(DLS),　X-ray　diffraction　(XRD),　Brunauer-Emmett-Teller　isotherm　(BET)　and　Fourier　transform　infrared　spectroscopy　(FTIR).　The　grape　seed　extract　played　the　role　of　a　stabilizing　agent　to　protect　GS-NZVI　from　agglomeration　and　oxidation.　Based　on　the　decolorization　efficiency　and　cost　saving,　the　optimal　grape　seed　extract　concentration　for　GS-NZVI　synthesis　was　0.2　wt%.　The　effects　of　dye　solution　pH,　GS-NZVI　dosage　and　initial　dye　concentration　on　dye　decolorization　were　investigated.　The　solution　pH　had　little　effect　on　dye　decolorization.　According　to　decolorization　efficiency,　reduction　capacity　and　reaction　time,　the　optimal　GS-NZVI　dosage　was　2.0　g　L-1.　The　decolorization　efficiency　(96.08-98.22%)　was　achieved　within　7　min　with　an　initial　RBR　concentration　ranging　from　500　to　2000　mg　L-1;　and　decolorization　efficiency　of　97.45-99.08%　was　achieved　within　17.5　min　with　an　initial　RBB　concentration　ranging　from　250　to　1000　mg　L-1.　The　kinetic　analysis　demonstrated　that　the　first-order　kinetic　model　was　more　suitable　to　describe　the　decolorization　processes　of　RBR　and　RBB　dyes.　The　UV-vis　spectra　showed　that　the　chromophores　of　the　dyes　and　some　functional　groups　were　destroyed　by　GS-NZVI.　GS-NZVI　has　good　application　prospects　because　of　its　low-cost,　eco-friendly　synthesis　and　significantly　high　decolorization　efficiency.