The invention discloses a collapse anti-collision beam system, which relates to safety devices of automobiles and can resolve problems that multi-stage collapse beams cannot be connected with each other or automatically controlled, and the collapse beams cannot be locked in time after stretching or retracting. The collapse anti-collision beam system comprises a multi-stage collapse mechanism, a stretching control device, a stretching locking control device, a retracting control device and a retracting locking control device, and the multi-stage collapse mechanism consists of more than two stages of collapse beams. A stretching circuit control device for the collapse beams controls stretching length of the various stages of collapse beams under the conditions of different automobile distances and automobile speeds, and accordingly timely control is realized. The collapse anti-collision beam system is applicable to various automobiles, and is used as one of safety systems of the automobiles.