The invention discloses a power grid underground pipeline facility safety monitoring system which comprises a vibration monitoring nerve net module, a laser, a transmitting and sensing optical cable, photovoltaic conversion equipment, a central processing unit (CPU) and a communication module, wherein the vibration monitoring nerve net module is used for monitoring intrusion damage vibration signals and intrusion noise vibration signals of a power grid underground pipeline facility; the laser is used for generating laser lights and transmitting the laser lights to the transmitting and sensing optical cable; the transmitting and sensing optical cable is connected with the vibration monitoring nerve net module and the laser, used for converting the intrusion damage vibration signals and the intrusion noise vibration signals into optical signals, and further used for carrying and transmitting the optical signals through the laser lights; the photovoltaic conversion equipment is connected with the transmitting and sensing cable; the CPU is connected with the photovoltaic conversion equipment; the communication module is connected with the CPU. According to the power grid underground pipeline facility safety monitoring system, early warning of intrusion damage behaviors from external force can be realized, the working efficiency of line inspection is improved, and the cost of line inspection is reduced.