The utility model discloses a GIS partial discharging simulation system. The GIS partial discharging simulation system comprises a 250 kV transformer and matched measuring control system, a GIS pipe, a direct current screen and a partial discharging measuring device. The 250 kV transformer and matched measuring control system is used for providing a high voltage source and comprises a 250 kV high voltage divider for dividing high voltage provided by the 250 kV transformer; the voltage class of the GIS pipe is 110 kV and single-phase, two sides of the pipe are provided with bushings, the pipe is provided with an isolation switch and an on-line monitoring interface, each segment of the pipe is a detachable independent structure, and the partial discharging level below 87 kV is less than 5 pC; the direct current screen provides a power supply for a control mechanism of the isolation switch in the GIS pipe; and the partial discharging measuring device can measure the partial discharging in the GIS pipe. The GIS pipe of the partial discharging simulation system is provided with the on-line monitoring interface, and different sensors can be installed so that different on-line monitoring devices can be tested, the dismounting of the pipe with independent structures is convenient, and different insulation defects can be simulated.