In order to solve the problems of complex structure, difficult troubleshooting and lack of real-time monitoring means of passive interception equipment, a set of real-time status monitoring system is designed. On-line detection technology and a variety of signal digital processing technology are used to obtain equipment status monitoring data, and through data processing and intelligent diagnosis, the equipment operation status can be grasped in real time, the cause of the fault can be accurately judged, the troubleshooting time can be shortened, and the maintenance efficiency can be improved. The actual application results show that the system can accurately obtain the information of key parts, display the parameter values after data processing and analysis, and give abnormal alarm information, which plays an important role in daily business and maintenance.