High-pressure pipeline safety monitoring system

The utility model provides a safety monitoring system for a high-pressure pipeline, which comprises a monitoring box, a plurality of oxygen concentration detectors and an alarm device, each oxygen concentration detector is respectively in electric signal connection with the monitoring box, and the alarm device is in electric signal connection with the monitoring box; the oxygen concentration detectors are installed in a cabin where the high-pressure oxygen supply pipeline passes and a channel where workers pass respectively to detect the oxygen concentration and send detected signals to the monitoring box, and after the detected signals are processed by a PLC module arranged in the monitoring box, if the detected signals exceed a preset value, an alarm is given; the system further comprises a plurality of gas leakage detectors, a worker inspects and detects a preset leakage part in the operation period of the gas supply system, the method is an online and offline leakage monitoring method which complements ea