The invention relates to a method for reducing residue stress of high-strength aluminum alloy complex die forgings and belongs to the technical field of aluminum alloy material processing. According to the method, the high-strength aluminum alloy die forgings are subjected to pressure maintaining and aging treatment after being subjected to solution hardening treatment and then are air-cooled. A certain pressure is applied to the forgings through a die. Most of tensile stress in the forgings can be offset while it is guaranteed that the sizes of the die forgings do not change. During the aging process, the residual stress is eliminated, and the aging strengthening effect is achieved. The residual stress is almost completely eliminated while the surface quality of products is guaranteed, the strength, plasticity and other indexes of workpieces can be improved, the comprehensive mechanical properties of the workpieces can be improved, and the purposes of obtaining better mechanical properties and reducing residual stress are both achieved. The method has the characteristics that the process is simple, operation and demolding are easy, and the requirements for equipment are low, and is particularly suitable for reduction of residual stress of high-strength aluminum alloy die forgings of complex shapes and suitable for industrial application and popularization.