The arched bridge pre-stressed structure, its goal is new old arch rib between exerts the pre-stressed through the pre-stressed in the arched bridge, old arch rib plays to the arched bridge reduces negative and the reinforcement role, establishes old in the arched bridge arch rib under, old arch rib with is new arch rib between is equipped with the pre-stressed loader, on the pre-stressed loader screw rod has a part to insert in with in the new arch rib permanent connection steel pipe, revolves on the pre-stressed loader nut, causes the screw rod to rise long, goes against the backing strip, the nut presses the backing strip, also depends upon newly through the pre-stressed loader arch rib picks up old arch rib.