The invention relates to a receiving end assisting decision-making method and device for a latching fault of a direct current transmission system. The method comprises a step of determining a failed unit in a receiving end power grid by using a k-means algorithm according to active and reactive power changes of a unit in the receiving end power grid before and after the latching fault of the direct current transmission system for the receiving end power grid with cross-section power out-of-limit and/or a frequency out-of-limit when the direct current transmission system has the latching fault,and a step of adjusting the power of the failed unit in the receiving end power grid. According to the technical scheme provided by the invention, the failed unit in the receiving end power grid is adjusted based on a k-means clustering algorithm to assist the direct current transmission system with the latching fault, the change of the receiving end power grid unit can be visually obtained before and after the latching fault of the direct current transmission system, and therefore, the latching fault of the direct current transmission system is assisted and handled in a targeted manner.