The invention relates to the field of power grid scheduling control, and particularly to a multi-monitoring-system simulation realizing method for a power grid simulation training system, and the simulation system thereof. The simulation system comprises a monitoring interface simulating module, a monitoring logic simulation module, a frontend system simulation module, a monitoring simulation picture set and a monitoring simulation database. The method and the system support realization of multi-monitoring-system simulation in one power grid simulation system. The monitoring system simulation modules are independent from one another and does not interfere one another. Furthermore the multi-monitoring-system simulation realizing method and the simulation system thereof have a good multi-monitoring-system combined simulation training capability.