The invention discloses a power emergency command system, comprising an emergency command platform, an auxiliary terminal and a power plant terminal, wherein the emergency command platform comprises an emergency data exchange and linkage platform, a prediction and early warning subsystem, and an emergency decision and command subsystem. When an emergency event occurs, the emergency data and linkage platform is used to achieve the collection and linkage of basic data, early warning forecast data, application evaluation data and emergency plan information; the prediction and early warning subsystem is used to respond to the emergency information; the emergency decision and command subsystem is used to realize fault identification, auxiliary decision and emergency command and dispatch; and finally the grid three-dimensional visualization system, video conference module and public information release module are used to release the emergency event. The emergency system integrates predictionand early warning, emergency decision and command, after-care recovery, simulation exercise and information release functions, and has the characteristics of high information integration, fast information integration, complete emergency function service and fast emergency response.