The invention discloses a NQI one-stop service cloud platform system for power grid equipment and the system mainly comprises an infrastructure layer which is used for managing all servers, storage, networks and database resources in cloud; a data service layer used for providing data access, data cleaning, data storage, data integration, data calculation, data analysis and data exchange servicesfor various applications according to the quality data model of the NQI system; a platform layer used for providing a cloud application support platform from software design, development, verification, release, operation and maintenance and operation of a complete life cycle, and providing end-to-end services for developers, operators, users and service providers; an application service layer which comprises a cloud portal and an operation management system, wherein the cloud portal provides application services for various user groups, and the operation management system provides services fordaily operation management of a cloud platform, breaks through quality information barriers of all links of a related system of the power grid equipment, integrates quality data of all the links, andsupervises production and operation quality of the power grid equipment.