The invention belongs to the technical field of the new type green energy battery, especially an aluminium ion secondary battery taking CuS as cathode and a preparation technology thereof. The cathode active material is CuS; the anode is metallic aluminium or aluminium-containing alloy; the liquid ion electrolyte is nonaqueous solution electrolyte containing AI3 +; the battery cathode and anode and the electrolyte thereof are packaged by insulating soft bags or assembled by cylindrical containers. The aluminium ion secondary battery provided by the invention can charge and discharge repeatedly, is featured by high capacity, good circulation stability, cheap raw material and environmental friendliness; the first charge and discharge specific capacity respectively is 270mAhg-1 and 275mAhg-1; the discharge platform reaches 1.15V(i)va.(/i)Al3+/Al. The aluminium ion secondary battery can be widely applied in fields such as the electronic industry, the communication industry and so on.