Danger level judgment method and device based on optical fiber vibration sensing system

The invention provides a danger level judgment method and device based on an optical fiber vibration sensing system. The method comprises the steps that vibration signals of areas corresponding to all optical fiber monitoring units are collected based on a preset sampling frequency; the collected vibration signals are filtered, and the filtered vibration signals form a vibration signal set; the vibration signal set is analyzed, and whether at least one mechanical excavation excitation exists or not is judged; if yes, obtaining frequency spectrum vibration signals corresponding to the vibration signals in which the mechanical excavation excitation exists, and determining a danger level corresponding to each mechanical excavation excitation based on each frequency spectrum vibration signal; judging whether the number of times of mechanical excavation excitation in a preset duration exceeds a preset number of times or not; if yes, alarm information is sent out, the alarm information comprises alarm position info