The invention discloses a low-tension high-conductivity aluminum alloy core aluminum stranded conductor for a transformer substation. The low-tension high-conductivity aluminum alloy core aluminum stranded conductor comprises an aluminum alloy core and a soft aluminum wire type aluminum stranded conductor. The aluminum alloy core is wrapped by the soft aluminum wire type aluminum stranded conductor. The aluminum alloy core is adopted for replacing a steel core, the mechanical performance is optimized, and the conductive performance is improved; compared with a conventional wire, the aluminum stranded conductor is adopted on the outer layer of the wire, under the same outer diameter, the aluminum section is increased by 8.3%, the conductive performance is improved, and the energy-saving effect is better; a 63%IACS soft aluminum wire (L4) is used for replacing the conventional energy-saving wire (L1), the conductivity is improved, and the conductive performance is improved; by adopting alow-tension high-conductivity aluminum alloy core aluminum stranded conductor bus, the rated breaking force is small, the mechanical performance is excellent, meanwhile, the current and resistance are low, the resistor loss is small, and the conductor is adopted as the bus, so that the energy-saving benefits are more obvious; the higher the transport power is, the better the energy-saving effectis.