The invention belongs to the technical field of gas pressure monitoring of GIS (gas insulated switchgear), and especially relates to a system for monitoring the pressure of SF6 in the GIS based on a wireless communication network. A wireless pressure detection module is installed on the GIS. The signal output end of the wireless pressure detection module is connected with a wireless routing modulethrough a Zigbee wireless network. The signal output end of the wireless routing module is connected with the wireless receiving module through the Zigbee wireless network. The signal output end of the wireless receiving module is connected with a GPRS module and a central monitoring system through a communication interface. The data of the GPRS module is connected with the data input end of a network computer through the binding of an IP address. A network computer data output terminal is connected with the data input end of a data communication module, and the output end of the data communication module is connected with a mobile data terminal through a mobile network. The system can remotely achieve the monitoring of the pressure of the gas in the GIS, is high in precision, is good inreal-time performance, and is high in safety.