An electrical power system three-dimensional digitalization operation platform comprises a data service layer, a function logic layer, a management unit, a basic unit, a public unit, a presentation layer, and an application layer. The data service layer comprises a three-dimensional model data bank, a topography image data bank, a business data bank, and a system management bank, wherein the business data bank and the system management bank store abutting joint relations with each power grid business platform. The function logic layer comprises a power grid business unit which is communicated with the data service layer, and is connected with the basic unit and the management unit, wherein the power grid business unit supplies six power grid business components, namely an auxiliary plan component, an auxiliary design component, an auxiliary operation-maintenance component, a construction progress component, an auxiliary emergency dealing component, and a data adjusting component. The management unit provides a system management component and a system maintenance component. The basic unit provides a basic three-dimensional browsing component and a three-dimensional analysis component which are both relied by a three-dimensional integrated platform. The public unit provides a main frame, a plug-in engine component, and a data access component which are all of the system. The presentation layer supplies a three-dimensional scene picture, a picture layer management view, a business data display view, an auxiliary design view for building a three-dimensional power grid. The application layer sends an analysis command of a leader and a maintain demand of data bank administrators to the data server layer, the function logic layer, and the application layer.