The invention relates to a hoisting method for an overlength overweight wire insulator chain. The hoisting method comprises the following steps that machine tools are prepared; an upper metal tool is installed in a crossarm hanging hole; a lower metal tool is connected to form a metal tool assembly; the metal tool assembly in the step 3 is connected with a hoist sliding vehicle set through a supporting hanging plate, and the hoist sliding vehicle set comprises a steel wire rope; the insulator chain is assembled, specifically, the hoist sliding vehicle set is lifted, and the insulator chain is formed by connecting insulators with the metal tool on the hoist sliding vehicle set piece by piece; and the insulator chain is wholly hoisted and hung and is connected with the metal tool on the crossarm hanging hole. According to the hoisting method for the overlength overweight wire insulator chain, the insulators are connected with the metal tool on the ground piece by piece, the insulator chain is hoisted in the connecting process, high altitude operation is avoided, supply and demand are simple, and the safety is high.