Underroad karst early warning device

The utility model discloses an under-road karst early warning device, which belongs to the technical field of early warning devices and comprises a pre-buried pillar and an early warning terminal, a PCB (printed circuit board) is fixed in the pre-buried pillar, a mounting block is arranged below the pre-buried pillar, a geological radar is arranged in the mounting block, a mounting bracket is arranged at the top of the pre-buried pillar, and an antenna assembly is arranged at the top of the mounting bracket. The PCB is electrically connected with the geological radar and the antenna assembly. The antenna assembly is in signal connection with the early warning terminal. The karst landform under the road is detected through the arranged geological radar, the real-time change of the karst is recorded, and the information is transmitted to the early warning terminal, so that early warning can be conveniently and timely made when the karst under the road changes, the practicability of the device is improved, and c