In this research, in order to improve the photocatalytic performance of ZnO nanostructure, Fe2O3-ZnO nanocomposite with a ratio (10:90) was made first, and the effect of adding Ag nanoparticles to this nanocomposite on the degradation of rhodamine B was studied. The produced products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS) and UV-vis absorption spectrum. The results of phase analysis showed that Fe2O3-ZnO nanocomposite was prepared with high purity. Analyzing the morphology of the nanocomposite, it was found that Fe2O3is in the form of particles with an average diameter of 28 nm, and ZnO is often in the form of nanorods with an average diameter of 72 nm. The results of optical analysis showed that by adding 0.1, 0.5 and 1% Ag in Fe2O3-ZnO/Ag nanocomposites, the optical gap from 2.60 eV in Fe2O3-ZnO to 2.60 eV, respectively 2.22 and 2.12 eV decreases. The results of the photocatalytic experiments showed that by adding silver to the Fe2O3-ZnO nanocomposite, the photocatalytic performance increases, so that the Fe2O3-ZnO/0.5% Ag and Fe2O3-ZnO/1%Ag nanocomposites are the best with the complete degradation of rhodamine B dye in 135 min. They show better photocatalytic performance compared to Fe2O3-ZnO and Fe2O3-ZnO/0.1% Ag nanocomposites.