The invention provides a network security target range system of an electric power monitoring system, which comprises a working area and a machine room area. The working area comprises an attack and defense test area, an electric power monitoring system operation area, a real object target range area and an attack and defense process display area. The machine room area comprises a main station monitoring area, a plant station monitoring area, an attack and defense display monitoring area and a virtual target range machine pool. The system is beneficial for technicians to construct a network security range system which takes a main station monitoring area, a plant station monitoring area, an attack and defense display monitoring area, an attack and defense test area, an electric power monitoring system operation area and a real object range area as a main body pattern. The constructed network security target range system enhances the working association degree and the working coordination degree between the internal unit areas, so that the system pattern tends to be clear, the security degree is improved, and the strain capacity is also improved. The attack and defense target rangecombining virtuality and reality is adopted, the virtual target range with rapid deployment and recovery capacity is achieved, and the physical target range with high intuition and obvious effect is also achieved.