The invention, which belongs to the technical field of the automatic voltage control of the power system, relates to a low-voltage reactive equipment voltage sensitivity statistics method in automatic voltage control of a transformer station. Reactive powers of a main transformer low-voltage side in a transformer station as well as bus voltage values of the high-voltage, medium-voltage, and low-voltage sides of the transformer station are monitored in real time; when the low-voltage-side reactive equipment of the transformer station takes action, statistics of reactive power change values of the low-voltage side of the transformer station and bus voltage change values of the high-voltage, medium-voltage, and low-voltage sides in the transformer station is carried out within a period of time after the action of the low-voltage-side reactive equipment of the transformer station; and a reactive voltage sensitivity result after the action of the low-voltage-side reactive equipment of the transformer station is calculated and is stored into a data base. Statistics of sensitivity effective values within 30 days is carried out regularly; according to the number of times of effective statistics of reactive voltage sensitivity, an average value of the reactive voltage sensitivity is calculated; and a reactive voltage sensitivity value used in the current automatic voltage control (AVC) system control is corrected. Because correction of reactive voltage sensitivity of buses of the high-voltage, medium-voltage, and low-voltage sides of the transformer station is carried out continuously, the AVC control becomes precise.