Ag-Graphene composites (Ag-RGO) were prepared using poly (N-vinyl-2-pyrrolidone) (PVP) as reductant and stabilizer under 60℃ reaction conditions. The synthesized Ag-RGO were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Uv-vis absorption spectra, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), respectively. The results showed that Ag nanoparticles with small-size and excellent dispersion were anchored firmlyon RGO sheet. The photocatalytic activity was evaluated by oxidation of AO7 under visible light irradiation. AO7 could be almost degraded completely within 120 min by 0.2Ag-RGO sample. The origin of high photocatalytic activity of Ag-RGO was discussed, which was mainly ascribed to the surface plasmo resonance effect of Ag nanoparticles in Ag-RGO composites. In addition, RGO acted as electron transmission channels. The synergistic effects induced by RGO also contributed to the high photocatalytic activity.