Single-walled carbon nanotubes (SWCNTs) demonstrate multiple unique advantages in the field of all-solid-state batteries. Their distinct one-dimensional structure provides the material with both extremely high electronic conductivity and excellent ion transport channels, allowing them to build an efficient electron-ion composite conduction network between the solid electrolyte and the electrodes. At the same time, the combination of their flexibility and high specific surface area helps to enhance the interface contact between the electrode and electrolyte, thereby effectively reducing interfacial impedance. Additionally, their outstanding mechanical properties can improve the battery's structural stability during repeated charging and discharging processes. As a result, SWCNTs are poised to play a crucial role in developing all-solid-state lithium batteries and solid-state lithium-sulfur batteries with high energy density, long cycle life, and high safety.