In our research, The Au-reduced graphene oxide (RGO)/TiO₂ nanotubes (NTs) photoelectrode was prepared by electrodeposition, and was characterized and analyzed by scanning electron microscope, X-ray energy scattering spectroscopy, X-ray diffraction, photoluminescence spectroscopy, and photoelectrochemical methods. The results show that the best preparation conditions is setting deposition voltage as 0.2 V and deposition time as 30 s. At the same time, the nano-gold is well supported on RGO/TiO₂ NTs without changing the original nanotube array structure. After a 35 W mercury lamp and a 15 V bias are applied, the photoelectric degradation efficiency of methylene blue is 72%, slightly higher thanthose of the other two electrodes. which show demonstrate that the photocatalytic activity of Au-RGO/TiO₂ NTs photoelectrodes under visible light is improved effectively.