The invention discloses a wide-area-measurement-system (WAMS)-based power grid safety and stability visualization method. The method comprises the following steps of: converting data to operations of angle stability visualization, voltage stability visualization, dynamic stability visualization, frequency stability visualization, thermal stability visualization, stability three-dimensional visualization and comprehensive stability visualization through a computer graphical display technology; effectively carding and integrating wide area measurement, monitoring, analysis, early warning and decision results so as to display the results to a dispatcher by visual means; and monitoring, actively early warning, actively analyzing and actively providing auxiliary decision results in real time, and providing key information needed by the dispatcher so as to realize a multi-angle multi-dimensional intuitive and visualized data display mode. Therefore, control over power grid operating conditions is strengthened by the dispatcher, existing abnormal or potential accident potentials are penetrated timely, and scheduling operation is developed from an experience type to analysis and intelligent types.