Abstract: In order to meet the large-scale requirements of the hydropower industry for informatized data storage, calculation and analysis, a smart hydropower cloud platform based on big data is studied and designed.The platform is accessible to multi-sourced data and realize data sharing of multi-system. The design of a fullstack platform architecture from data to application improves the availability of the system and reduces the redundancy of data. The status evaluation and fault diagnosis of the equipment is carried out based on the intelligent algorithm. The application system is developed to make the platform easy to expand based on the idea of micro-services. This architecture is available to all hydropower plants, centralized control centers and production management organizations, and has been applied in multiple hydropower plants.