A collide energy absorbing device forms concussion buffering components of a plurality of concussion buffering portions with frame body and fixed on the frame body to the main component parts, the concussion buffering portions form cross-section of air core tube shape approximately like Chinese character 8 made of metal, which have sidewall portion respectively protruding outside continuous with both ends of the center plate portion and plate-shaped front sidewall and plate-shaped back sidewall continuous with the other end of the sidewall portion; also providing with leg or pillar fixed on the road surface; or also providing separating wall fixed in the front end of the base of the guiding channel to form an entirety together with the base of L shape; a front separating room and a back separating room formed at front and back of the separating wall by the separating wall and the casing; concussion buffering components mounted in the front separating room and the back separating room;when vehicle colliding, the guiding channel fixed on the base of the road surface guides to move backwards.