The invention relates to a power grid GIS platform and specifically to an emergency command auxiliary decision-making system based on the power grid GIS platform. The emergency command auxiliary decision-making system is based on a power grid GIS geographic information system, uses an accurate electronic map as a reference, and provides emergency command with accurate personnel, equipment, vehicles, and material basic data. By means of the combination of a power map and emergency information resources, a standard, complete, unified, high-efficient emergency deploying, collecting and publishing platform is established. All links related to power supply production and operation such as power supplies, transformation stations, power transmission lines, power distribution networks, and power users are vertically communicated through a space diagram layer stacking and integrating manner. A power space data model with dynamic and static data interaction is formed. Comprehensive decision support for a whole company and a county company is achieved.