The invention provides an electric-power-system hybrid simulation parallel computing system and a task scheduling method thereof. The system comprises a scheduling unit, a data storage unit, a computing unit and a man-machine interaction unit. The scheduling unit is used for scheduling simulation computing tasks and receiving and forwarding simulation computing result files. The simulation computing task scheduling includes distributing the simulation parallel computing tasks to one or more idle resource CPU cores in the computing unit according to the received number of CPU cores, required byeach simulation parallel computing task, of the computing unit. The data storage unit is used for storing the computing result files forwarded by the scheduling unit and log files generated during system operation. The computing unit is used for receiving computing input data or computing commands from the scheduling unit, performing computing, and returning computing results to the scheduling unit. The man-machine interaction unit is used for issuing simulation computing task data to the scheduling unit.