The invention belongs to the technical field of maintenance and management of a giant hydraulic power plant, and particularly relates to an intelligent control system for the overall maintenance process of the giant hydraulic power plant. The intelligent control system comprises a maintenance management module, a data integration module, a data model module, a maintenance estimation module, a network communication module, a server, a data transmission module and a cloud data control platform, wherein connection among the maintenance management module, the data integration module, the data model module and the maintenance estimation module is built by a network environment, and the maintenance management module, the data integration module, the data model module and the maintenance estimation module are all connected with the network communication module. By matching of the maintenance management module, the data integration module, the data model module, the maintenance estimation module, the network communication module, the server, the data transmission module, the cloud data control platform and a display, the maintenance management efficiency and the production management efficiency of the hydraulic power plant are substantially improved, the maintenance standard operation flow is further standardized, maintenance information management is achieved, so that the maintenanceprocess tends to be intelligent.