Abstarct: In this study, silver-reduced graphene oxide nanocomposite (Ag / RGO) was prepared using Ziziphus zizyphus extract as a reducing and stabilizing agent. Reduced graphene oxide was used as substrate because of its high surface area and chemical stability. Ag / RGO nanocomposites were characterized by Common methods such as Fourier- transform infrared spectroscopy )FT-IR), X-ray diffraction pattern (XRD), Scanning electron microscopy (FE-SEM), energy- dispersive X-ray spectroscopy (EDS), UV-Vis spectroscopy and Raman spectra. The photocatalytic behavior of Ag / RGO nanocomposite in the degradation of rhodamine bi dye in aqueous solution as well as its effective factors such as the concentration of rhodamine bi dye, the amount of Ag / RGO nanocomposite and the pH of the solution were investigated. Photocatalytic degradation of 100 ml of rhodium solution at 1 ppm concentration by 20 mg Ag / RGO nanocomposite at pH 6 was complete within 45 minutes, with the highest percentage of rhodamine degradation being 91.34%. It was also found that the rate of degradation was first-order.