An embodiment of the invention provides a method, device and system for synchronously calibrating BMS (battery management system) information acquisition for charging poles. The method comprises: sending equidifferent current pulse to a battery module at a specified moment according to preset circulating rules; receiving a voltage data set corresponding to the equidifferent current pulse and sentby a BMS of the battery module, wherein the voltage data set is voltage data acquired by the BMS testing voltages of battery cells of the battery module under corresponding equidifferent current pulse; calculating an average voltage difference of each battery cell in the battery module within each circulation according to the voltage data so as to obtain an average voltage difference array; synchronously calibrating BMS information acquisition according to the average voltage difference array and equidifferent current pulse tolerances so as to calculate resistance of each battery cell.