Photocatalysis has received extensive attention due to its advantages of mild reaction conditions and direct conversion of solar energy to chemical energy. Improving the solar absorption range and reducing the recombination of photo-generated “electron-hole” pairs are the hot topics in the field of photocatalysis. In this work, the amorphous TiO₂ nanotube arrays (TiO₂NTs) were prepared by anodic oxidation, and indium-tin (In-Sn) alloy was pressed into the amorphous TiO₂NTs by a mechanical hydraulic method to make In_9.45Sn₁/TiO₂NTs, then the In_9.45Sn₁/TiO₂NTs were annealed in air to obtain indium tin oxide (ITO)/TiO₂NTs. The photocatalytic properties of the obtained TiO₂NTs, In_9.45Sn₁/TiO₂NTs and ITO/TiO₂NTs on the removal of methylene blue in aqueous solution were studied and compared. After 180 min visible light irradiation, the degradation efficiency of the ITO/TiO₂NTs reaches 96.14%. The applying UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) to explore the optical adsorption abilities of the samples shows the strongest absorbance of ITO/TiO₂NTs. Combining the results of transient photocurrent responses, photocurrent density-potential, electrochemical impedance spectroscopy, and Mott-Schottky plots, the ITO/TiO₂NTs have higher charge transfer capability and donor density than do other samples, which can reduce the recombination of holes and electrons, thus improving the visible-light catalytic performance. After five cycles, the degradation rate of the ITO/TiO₂NTs still maintains 90.28%. Results of free radicals trapping experiments reveal that •O₂^- and •OH are the main active substances for the photocatalytic degradation.