The invention discloses a static safety analysis system with a dispatcher accident prediction supporting function and belongs to the field of control. The static safety analysis system is characterized by in the scanning of preconceived faults of an online static safety analysis module in the static safety analysis system, adding an analyzing function of the operation of the automatic switching device of the standby power supply, achieving N-1 scanning after the operation of the automatic switching device of the standby power supply, computing the power flow after the operation of the automatic switching device of standby power supply in order to accurately reflect a power flow change after the operation of the automatic switching device of the standby power supply, and generating an accident preconceived text based on an analyzed result. The static safety analysis system may simulate and analyze power grid power flow distribution states in different operating modes, enables the dispatcher to be capable of online researching the safety stability of an regional power grid in real time, improves the safety stability of real-time online power grid research, generates available accident preconceived texts for the dispatcher, improves a capability of treating emergency power grid accidents for the dispatcher, and achieves dispatcher accident prediction supporting function.