Abstract: In order to monitor the operation status of high voltage switchgear in real time, using passive wireless surface acoustic wave (SAW) temperature sensor, transient earth voltage sensor, acoustic emission sensor and so on, a more comprehensive multi-dimensional state monitoring is established for the on-line monitoring of high-voltage switchgear, and the temperature state, partial discharge phenomenon, mechanical characteristics and vibration characteristics of the switch cabinet are monitored in real time. It can be found in time when abnormal temperature or frequent partial discharge occurs in the switch cabinet. Through the real-time monitoring between the intelligent data acquisition system and users, the reliability of high-voltage switch cabinet operation can be improved and abnormal operation can be found. Using the multi-dimensional state monitoring data can provide a reliable basis for project monitoring.