The invention relates to a method for recognizing alternating-current busbar voltage weak points during direct-current power transfer. The method comprises the steps that all alternating-current busbars ACj along communication channels passed during direct-current power transfer of direct-current systems DCi in a power grid are determined; equivalent impedances (shown in the description) from the direct-current systems DCi to the alternating-current busbars ACj are calculated; voltage drop coefficients alpha ij of the direct-current systems DCi and the alternating-current busbars ACj are calculated; the alternating-current busbars weakest in voltage during direct-current power transfer are determined according to the voltage drop coefficients alpha ij. According to the method, the voltage drop coefficients of different direct-current systems and the alternating-current busbars during direct-current power transfer are defined by analyzing the influence on voltage drop amplitude of all points in the alternating-current power grid during power transfer of different direct currents, the alternating-current busbars highest in voltage drop speed under the same power transfer situation and the direct-current systems having greatest influences on the voltage drop amplitude of the busbars can be recognized by comparing the coefficients, and guidance can be provided for safe and stable operation of the power grid.