Abstract: This paper starts from solving the specific problem that the existing underground gas beam tube monitoring system is difficult to find the fault location of the beam tube, provides a fault monitoring device embedded in underground gas beam pipe monitoring system, determines the monitoring technology and method including gas tightness test, system calibration and real-time monitoring of gas beam pipeline fault monitoring device in underground coal mine. It ensures that the failure of the beam pipe line is eliminated timely and effectively, and the availability and reliability of the gas beam pipe monitoring system are ensured.