The invention relates to a voltage safety range determination method considering AC/DC hybrid power network faults, belonging to the technical field of power system safety and control. Firstly, the reactive voltage sensitivity of the converter station is calculated according to the different operation modes of the converter station on the DC rectifier side and the converter station on the DC inverter side. Then, after the AC/DC hybrid power network fails, the voltage variation of each bus bar under the current operation state is obtained. Finally, the safe operation range of each bus in AC/DChybrid power network is calculated. The voltage safety operation range of each bus bar of the AC/DC hybrid power network calculated by the invention can ensure the voltage safety of the power networkand the reliability of the power supply.