The invention discloses a method and system for identifying the phase sequence of a low-voltage distribution network transformer area, and belongs to the technical field of data processing. The methodcomprises the steps of acquiring information data of the low-voltage distribution network transformer area, and selecting complete data to serve as target daily data; and obtaining a multi-class clustering data curve, and determining the phase sequence attribute of the multi-class clustering data curve for the low-voltage distribution network transformer area according to the similarity between the voltage data of an electric energy meter general meter or an electric energy meter three-phase meter in the target daily data and the multi-class clustering data curve. According to the invention,the accuracy of phase sequence identification for electric energy meters of different power supply users can be effectively improved. The density clustering analysis method not only can increase the accuracy of the phase sequence identification, but also can improve the accuracy of the user-to-transformer relationship at the same time.