The invention discloses an integral resetting method for a large flexible steel structure, which comprises the following steps: integrally jacking the flexible steel structure by adopting a synchronous jacking device, so that each main fulcrum of the flexible steel structure is separated from an original support foundation and is in a suspended state borne by the synchronous jacking device; an asymmetric reset strategy is adopted, and all main fulcrums are divided into a reference fulcrum group and a reset fulcrum group in a suspended state; keeping the horizontal position of the reference fulcrum group fixed, applying a reset acting force in the horizontal direction to the reset fulcrum group, and driving the reset fulcrum group to move along a preset reset path until the distance between the reset fulcrum group and the reference fulcrum group is recovered to a design theoretical value; in the state that the reset fulcrum group is kept to be borne by the synchronous jacking device, the reference fulcrum group falls to a temporary bearing foundation and is temporarily fixed; and after the reference fulcrum group is temporarily fixed, the reset fulcrum group falls to the temporary supporting foundation and is temporarily fixed, and overall reset is completed. The method is high in construction safety and wide in application range.
