Abstract: Carbon nanotubes (CNTs), as striking nanomaterials, have shown enormous potential in the field of semiconductor energy storage.This article reviews the preparation methods, electrochemical properties, and applications of CNTs in energy storage devices, including various preparation methods such as chemical vapor deposition, arc discharge, and solution method.CNTs exhibit excellent conductivity and chemical stability, providing an ideal foundation for energy storage device design.The key role of CNTs in the fields of supercapacitors, lithium batteries, and photovoltaic power generation was discussed, which can serve as electrode materials and conductive additives to improve device performance and cycling stability.This study provides strong insights for the development of new generation energy storage technologies, and is expected to play an important role in improving the energy density of supercapacitors, rapid charging and discharging of lithium batteries, and improving the efficiency of photovoltaic power generation.