The utility model discloses an ultrahigh frequency local discharge simulation device. An auxiliary power supply coverts the externally-connected 220V alternating current to the direct current voltage and provides power supply to a main controller, a high voltage discharge gun and a radio frequency generator. A mode conversion module controls the main controller to transmit start-up signals to the high-voltage discharge gun and enables the high voltage discharge gun to discharge constantly. The phenomenon that the ultrahigh frequency electromagnetic wave is transmitted to the surrounding space when the local discharging is happening can be revealed directly and objectively through the combined test with an ultrahigh frequency local discharge test instrument. The main controller is controlled to transmit control instructions to the radio frequency generator through the mode conversion module, and the radio frequency generator transmits ultrahigh frequency electromagnetic waves, so that the trainee can understand the generation theory of the local discharge ultrahigh frequency electromagnetic wave through the measurement of the simulation device and can master the usage technique of the ultrahigh frequency local discharge measurement. The ultrahigh frequency local discharge simulation device can solve the problem in the prior art that the safety hazard exists when the measurement operation is performed on the system using the power device.