In the coal mine high voltage power supply system, the protection setting value whether meets the selectivity and reliability cannot be determined by short circuit experiment in the field, so this paper propose the simulation test system of protection setting value in coal mine underground high voltage network, to simulate the selectivity and reliability of underground flaut detection protection setting value. The whole design scheme of simulation protection setting value in coal mine underground high voltage power network is introduced, breadthfirst search algorithm based topology selflearning of coal mine underground supply systems is carried out, based on the obtained topology model, the simulation calibration algorithm of the fault current calculation, timing overcurrent protection, transient speed circuit protection and overload protection is proposed. The experimental results show that the system can test whether the coordination between timing overcurrent protection and transient speed circuit protection is reasonable, and whether the current settings of each segmental will cause blackout area expanding, and effectively realize the simulation test of underground highvoltage power system relay protection setting.