The embodiments of the invention provide a method, a device and a system for a charging pile to detect the internal resistance distribution of a battery pack. The method for a charging pile to detectthe internal resistance distribution of a battery pack includes the following steps: sending a sequence current pulse to the battery pack at a specified time; receiving a battery state array corresponding to the sequence current pulse sent by a battery management system of the battery pack, wherein the battery state array includes multiple sets of voltage data and battery temperature data sets obtained through test of the battery pack by the battery management system under the sequence current pulse; calculating the resistance data set of each battery cell in the battery pack according to themultiple sets of voltage data and the pulse current data; and fitting each battery temperature data set and the resistance data set at the corresponding time in a coordinate system to obtain the resistance and temperature change curve graph of each battery cell, and then, obtaining the internal resistance distribution of all the battery cells in the battery pack.