The invention provides a direct current power flow controller topological control method used among three lines, comprising the following steps of establishing a direct current power flow controller among three lines, connecting three power transmission lines through the direct current power flow controller, realizing a power flow regulation function of the three power transmission lines, whereinthe direct current power flow controller among three lines comprises a direct current power flow controller, a bypass switch and the like; and enabling the three direct current lines to be connected to the direct current bus of the same voltage source type converter, wherein the voltage source type converter is connected with a direct current power system and an alternating current power system for converting alternating current and direct current, the direct current power flow controller among three lines is equivalent to a voltage source connected in series among the three lines, so as to realize power transfer among three series voltage sources to further regulate the values of the three series voltage source voltages and to realize line power flow control. By virtue of the direct current power flow controller topological control method, power flow control of three lines is realized, and the power flow control dimensionality of the complex multi-end direct current power system is improved; and the direct current power flow controller topological control method has a symmetrical structure and is applicable to a power flow conversion occasion.