The invention discloses an intelligent monitoring system of a static synchronous compensator. The functions of basic monitoring control and the like of the device can be ensured, and data mining and state evaluation can also be carried out on an STATCOM device. The system comprises a station control layer and a spacer layer, wherein the spacer layer is connected to the STATCOM device and the station control layer; the spacer layer is used for collecting running state data of the STATCOM device in real time and storing the operating state data; and the station control layer is used for obtaining the operating state data, carrying out basic control operation, security and stability analysis, abnormal excavation and prediction and operation optimization on the STATCOM device according to the operating state data, carrying out state evaluation on various electric devices of the STATCOM device and determining whether maintenance is needed or not according to the state evaluation result.