The invention discloses a construction method for quick gate installation. Each lifting mechanism lifts a gate to release from a cushion block; the side surface of the gate in the thickness directionis totally bonded with the surface, facing the gate, of a stopper to adjust the verticality of the gate; and the levelness of the gate is adjusted through adjustment of the height of each lifting mechanism. The construction method is simple; used auxiliary devices are simple in structure, easy to manufacture and convenient to use; and a crane is cooperated to quickly adjust the horizontality and the verticality of the gate to meet requirements, so that the once in-place fixed installation of the steel gate is guaranteed, the service time of the crane can be greatly shortened, the operation efficiency is improved, the labor intensity of workers is relieved, and the gate installation cost is reduced.