The utility model provides an aluminum alloy core aluminum stranded conductor applied to 1000KV AC extra-high voltage. The aluminum alloy core aluminum stranded conductor applied to the 1000KV AC extra-high voltage comprises a reinforcement core composed of three layers of aluminum alloy conductors, two layers of aluminum conductors are wound on the outside of the reinforcement core, and the diameter of aluminum alloy core aluminum stranded conductor composed of the reinforcement core and the aluminum conductors is 33.6 mm. The stranded direction of the aluminum conductor at the outermost side of the aluminum alloy core aluminum stranded conductor is right, and the stranded direction of the adjacent layer of aluminum conductor is inverse. According to the utility model, the reinforcement core is an aluminum alloy core, is based on the three-layer structure, and has the advantages of good sag characteristic and tensile strength, so that the aluminum alloy core aluminum stranded conductor applied to the 1000KV AC extra-high voltage provided by the utility model enables the transmission capacity of an extra-high voltage power transmission line to be improved and the resistor loss to be reduced.