The geomagnetic induced current (GIC) caused by geomagnetic storm may result in DC bias of the transformer, which poses threats to the safe and stable operation of the power grid. Remote real-time monitoring of GIC can provide important reference for grid GIC defense. Based on cloud server, a GIC monitoring system is designed. The data acquisition terminal collects the transformer’s neutral point GIC in real time. Using GPRS, the data from multiple monitoring points are sent by different ports to the internal network of the cloud server for storage. It is possible for users to access the data remotely through the public network IP of the cloud server and process data via drawing and downloading. The real-time release and sharing of GIC data has been realized via this system. Combined with the forecast data of space weather, the early warning of GIC is preliminarily realized. Tests of the data acquisition terminal of system and the monitoring software platform based on the cloud server in the laboratory and substation field show that the system has achieved the design requirement and meets the functional requirements.