Tunnel road safety structure based on drainage system

The invention discloses a tunnel road safety structure based on a drainage system. The tunnel road safety structure comprises pre-buried parts distributed on the two sides of a tunnel. The upper end faces of the pre-buried parts are flushed with the upper end face of the road surface of the tunnel. A drainage cavity with an opening formed in the top is formed in each pre-buried part. One or more composite protection rod is arranged at the top open end of each drainage cavity at equal distance. The composite protection rods are distributed in the length direction of the pre-buried parts at equal distance. The two sides of each composite protection rod are hinged to connecting lugs on the inner wall of the corresponding drainage cavity. A buffer supporting part is arranged at the bottom of each composite protection rod. The composite protection rods are jacked by the buffer supporting rods and can be parallel to the horizontal plane. According to the tunnel road safety structure, the space in the tunnel cannot