Road and bridge construction warning device

The utility model discloses a road and bridge construction warning device which comprises a bridge body, the bridge body comprises an arch bridge and a concrete supporting platform, a wall attaching plate is fixedly connected to the inner wall of the arch bridge through bolts, a sliding groove is formed in the middle of the front vertical face of the wall attaching plate, and a sliding block is connected into a groove opening of the sliding groove in a sliding mode. According to the road and bridge construction warning device, when the floating rim ascends, the connecting rod ascends, meanwhile, the vertical rod fixed to the connecting rod can move upwards, and the noctilucent scale strip connected to the right wall of the vertical rod is driven to move upwards; the glass sleeve arranged on the upper portion of the noctilucent scale strip is fixed to the outer wall of the bridge body, when the noctilucent scale strip moves upwards, the noctilucent scale strip can move upwards in an inner cavity of the glass s