The invention discloses a semi-rigid bridge anti-collision guardrail. The anti-collision guardrail comprises a plurality of guardrail steel framework structures which are sequentially connected, and the plurality of guardrail steel framework structures which are sequentially connected form a multiple arch structure; the guardrail steel framework structures comprise steel longitudinal beams, archedsteel pipes and two steel vertical columns, the two ends of the steel longitudinal beams are fixedly connected with the two steel stand columns respectively, and the two ends of the arched steel pipes are fixedly connected with the two steel vertical columns respectively; inhaul cables are anchored between the steel vertical columns at the two ends of the multiple arch structure; in the steel longitudinal beams, the arched steel pipes and the inhaul cables, the steel longitudinal beams are arranged close to one side of a bridge deck in the direction of the width of the bridge deck; the archedsteel pipes are arranged at a position,away from the bridge deck relative to the steel longitudinal beams; the arch tops of the arched steel pipes face one side of the bridge deck, steel pipe columnsfor transmitting force are connected between the arched steel pipes and the steel longitudinal beams, and the inhaul cables are arranged at a position far away from the bridge deck relative to the arched steel pipes. The problem that the anti-collision performance of the anti-collision guardrail is insufficient in the prior art is solved.