At present, the fault location method for DC transmission lines mainly adopts the traveling wave method. However, in MMC-HVDC the traveling wave method has problems such as difficulty in capturing the wave head and determining the wave velocity, resulting in inaccurate positioning results. Therefore, this article adopts a method based on virtual node current calculation to locate bipolar short-circuit faults in DC transmission. Firstly, based on the topology structure of MMC, the flow path of bipolar short-circuit current is analyzed, and then the short-circuit impedance of each component in the DC transmission system is obtained. According to the requirements of fault location error, define a “virtual node”, write the voltage equation of the node when a bipolar short circuit fault occurs based on the distribution position of the short-circuit voltage measurement device on the transmission line, and solve the short-circuit current vector of the “virtual node” through compressive sensing technology. Locate the fault occurrence point by solving the position of non-zero elements in the short-circuit current vector. Through simulation verification, it is known that the method proposed in this paper can effectively locate the fault point for bipolar short-circuit faults in MMC DC transmission, and has good ability to withstand grounding resistance.