For the new generation smart substation construction requirements and SGCC’s integrated equipment technical requirements, a kind of high voltage switchgear/GIS function integrated monitoring device is designed. According to the functional characteristics, discrete mechanism monitoring IEDs, measuring IEDs, main monitoring IEDs, lightning arrester monitoring IEDs are integrated, and the high voltage switchgear’s state monitoring, on-site diagnosis, and secondary equipment online monitoring functions are achieved. The result of testing and field operation shows, the integrated device effectively reduces the number of bay monitoring devices, and has a good application prospect and popularization value.