A series of TiO2-reduced graphene oxide (RGO) nanocomposites were prepared by a green one-pot hydrothermal reactions using P25 as the titania precursor and graphene oxide (GO). Our method provides the notable advantages of a one-step reaction without employing toxic solvents, thereby providing a green, simple and quick synthetic route to produce TiO2-RGO nanocomposites. The synthesized nanocomposites showed enhanced photocatalytic activity compared to P25 under UV-vis illumination, it even can degrade the Rhodamine (Rh) B in the dark conditions.