The invention provides a hoisting device for high-rise building multilayer bracket supports and an installation method thereof. An upper rigid support, four steel wire ropes and a lower rigid supportare sequentially connected between a hook steel wire rope of an automobile crane and a support to serve as an auxiliary transition hoisting device; and the four steel wire ropes of the auxiliary transition hoisting device are separated by a preset distance, the four steel wire ropes can sleeve the brackets layer by layer, and the supports connected with the lower rigid support are vertically hoisted in place to the brackets of each row of each column, so that it is guaranteed that the supports are vertically lifted in place by adding the auxiliary transition hoisting device, and the difficultythat the automobile crane cannot be vertically hoisted under the condition of small interval of the laminated brackets is solved. With the auxiliary transition hoisting device, the hoisting safety, reliability and stability are guaranteed, and requirements of national hoisting equipment hoisting specifications are met.