Reduced graphene oxide loaded silver (RGO/Ag) nanomaterials as a new nanocomposite film were prepared by in-situ redox method. The RGO/Ag nanomaterials were characterized by SEM, Raman spectra, XRD, UV-vis and TGA. The silver nanoparticles were well decorated and dispersed on the RGO nanosheets. Moreover, RGO/Ag nanomaterials were used to remove fluoride ion in domestic water. The influence factors including concentration of RGO/Ag, pH of water, the adsorption time and temperature on the removal rate of fluoride ion in domestic water were discussed. The results show that the removal ratio of fluoride in domestic water reaches up to 90% at the condition of 0.1g/L RGO/Ag, 60 oC and 20h of adsorption temperature and time. Our RGO/Ag nanomaterials have great potentials for water treatment toward environmental remediation, especially for water treatment.