The invention belongs to the technical field of overhead conductors of electric transmission lines, and particularly relates to an intermediate strength aluminum alloy wire for an overhead conductor. According to the intermediate strength aluminum alloy wire provided by the invention, solution treatment is effectively carried out on an aluminum alloy rod and subsequent aging treatment realizes a better effect through certain alloy composition adjustment, rolling and control of online quenching, so that the intermediate strength aluminum alloy wire with the elongation which is not less than 3.5%, the electric conductivity which is not less than 58.5%IACS (International Annealed Copper Standard) and the tensile strength which is not less than 245MPa is finally obtained. The elongation of the intermediate strength aluminum alloy wire provided by the invention is remarkably superior to that of aluminum alloy wires in the prior art. The intermediate strength aluminum alloy wire has the advantages that the wire is great in pulling weight ratio, good in sag characteristic, good in high temperature characteristic and damage- resistant in the surface. As no steel cores are available, magnetic hysteresis loss and eddy loss are avoided. In operation, the alternating current resistance of the wire is lower than that of aluminum cable steel reinforced, so that the electric energy loss is reduced. The intermediate strength aluminum alloy wire provided by the invention is used more and more in electric transmission lines and has a wider range of application.