The invention discloses a low-current grounding line selection method for a dispatching master station end and relates to the technical field of power system distribution networks. The method specifically comprises the steps that: the dispatching master station end obtains a remote measurement value of each line on each bus of a plant station end in real time, and a phase current variation delta Ii and a reactive power variation delta Qi of each line on a grounded bus before and after a grounding fault occurs are calculated according to the remote measurement value, wherein a variable i represents a line on the bus; the probability that each line on the grounded bus is a grounded line is calculated according to the phase current variation delta Ii and the reactive power variation delta Qiof each line, and the test pull of lines is carried out based on a descending sort of probability values to complete fault elimination. According to the method, the probability sequence of grounding lines is rapidly and visually given, a dispatcher can pull the lines according to a sequence result, so that fault lines are rapidly and accurately found out, the safe and stable operation of a power grid is better ensured, the practicability is high, and the application range is wide.