Monitoring and early warning device and method for tunnel top collapse in peak cluster landform karst area

The invention provides a peak cluster landform karst area tunnel top collapse monitoring and early warning device and method, and the method comprises the steps: selecting a monitoring target area, arranging a monitoring and early warning instrument outside a tunnel in the monitoring target area, arranging a monitoring and early warning instrument inside the tunnel on a safety helmet of a constructor, and judging the early warning level based on the monitoring information of the monitoring and early warning instrument outside the tunnel. And controlling a monitoring and early warning instrument in the tunnel to give different types of alarms based on the early warning level, and reminding a constructor to take corresponding measures according to the early warning level. According to the method, karst collapse occurrence can be predicted, constructors can be reminded in time, and the problems of casualties and property loss caused by untimely early warning due to the fact that roof collapse is not monitored an