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In order to solve the problem of low sensitivity and high detection line in the detection of ambient air TVOC content by traditional equipment, an online real-time monitoring and warning system for ambient air TVOC that is suitable for rapid field analysis and does not require personnel to be on the scene is designed. The system uses thermal desorption and PID sensor to realize trace detection of ambient air TVOC content.The actual test results show that the system has detection lines as low as 1 ppb, with an indication error of less than 5 %, repeatability of less than 3 %, and good stability, which meets the expected design requirements.