The invention discloses a multi-infeed HVDC (high-voltage direct current) system partitioning method based on the mounting of fault current limiters. The fault current limiters are mounted on proper alternating current lines, so that a multi-infeed HVDC system is partitioned into a plurality of regional power grids which are isolated from one another by the fault current limiters; when the alternating current system in a certain regional power grid in the multi-infeed HVDC system is subjected to a short circuit fault, the impedance of the fault current limiter is increased to a rated value, so that an electrical distance among the regional power grids can be increased, and the short circuit fault can be prevented from being transmitted to other regional power grids from the faulted regional power grid; and the alternating current bus voltage in other regional power grids is increased, the phase change failure duration of each HVDC line in each of other regional power grids can be shortened, and the recovery speed of the transmission power of the direct current lines can be increased, so that the problems of power imbalance and flow transferring of the alternating current system caused by the simultaneous phase change failure of the HVDC lines in the multi-infeed HVDC system can be relieved, and the safety and stability of the multi-infeed HVDC system under the condition of the short circuit fault of the alternating current system are improved.