The invention relates to a transformer area topology automatic recognition method and system, and belongs to the technical field of power low-voltage distribution networks. The method comprises the following steps: on the basis of determining a topological relation between upper and lower stages of each branch, determining the incoming line ends of all branches based on the fact that the current of the branch incoming line ends is the sum of the current of the outgoing line ends of the branch incoming line ends, and determining the connection relation between incoming lines and outgoing linesof different branches according to the principle that the current of the outgoing line ends of the branches is equal to the current of the next-stage branch incoming line ends connected with the branches, and thereby determining the connection relation between the branches. The above process can effectively avoid the problems of communication crosstalk in a power frequency communication mode and unsafe and large interference in a pulse communication mode, and improves the accuracy of topology recognition.