The invention relates to a monitoring method of a mine gas beam tube line monitoring system. The mine gas beam tube line monitoring system is used, and the monitoring method of the mine gas beam tube line monitoring system mainly comprises the steps that (1) a beam tube line air-tight test is conducted firstly; (2) particularly, system standardization is conducted; (3) the mine gas beam tube line monitoring system is monitored in real time, and meanwhile real-time data and the work state are displayed on an industrial personal computer, a real-time data display window and an implementation work state window. It is guaranteed that beam tube line faults are timely and effectively eliminated, usability and reliability of the mine gas beam tube line monitoring system are improved, a troubleshooting range of the beam tube line faults is greatly narrowed, and maintenance men can accurately determine quality and specific positions of the tube line faults according to display of the industrial personal computer, an alarm of an audio alarm, and the real-time data and the work state which are displayed on the real-time data display window and the implementation work state window.