Abstract: To effectively address practical challenges such as insufficient coordination between power grid planning and urban planning, as well as difficulties in data integration, this paper designs and implements a smart power grid planning management platform based on three-dimensional(3D) WebGIS. This platform integrates multi-source spatial data management with 3D visualization capabilities, supporting core functions such as power grid data analysis, load forecasting, and planning evaluation. It significantly enhances planning efficiency and decision-making rigor, providing reliable technical support for achieving organic synergy between power grid and urban planning while advancing the scientific and sustainable development of power grid layout.