Height-limited automatic early warning device

The utility model provides a height limit automatic early warning device, including along the traffic flow direction set up superelevation sensing device and blocking early warning device in proper order, superelevation sensing device includes stay cord and trigger device, stay cord is connected with trigger device, stay cord is used for sensing superelevation vehicle, and the trigger device is connected with the stay cord. And the triggering device is used for controlling the blocking early warning device to carry out early warning blocking. The pull rope is adopted to sense the over-height vehicle, so that blocking and early warning are carried out, and the function of early warning in advance can be well achieved; the pull rope is used for sensing the vehicle, the vehicle cannot be damaged after touching the pull rope, and the maintenance cost can be saved for a driver; and after the pull rope is broken, the normal work of the device can be recovered only by replacing the pull rope, so that the maintenance