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The low-voltage substation is at the end of the power system. In the construction of new power system in the future, the substation topology relationship monitoring is an important link to improve the fine management and power supply service level; Since it is impossible to accurately know the changes of on-site lines and equipment in the low-voltage substation area, there are often problems such as confusion and loss of control in the substation area line topology files, which seriously affect the line loss management, fault operation and maintenance and other work; In order to accurately identify and establish the topology relationship of the line in the substation area, the structure of the low-voltage substation area and the principle of topology identification are analyzed. Based on the voltage and current signal identification method, the characteristic sequence signal identification strategy is studied, and the key hardware modules are designed. A substation area topology monitoring technology based on signal identification is proposed, which can accurately identify the topology relationship of the substation area without affecting the operation of the low-voltage substation area; Through the field application test, the topology monitoring under the operating conditions of the station area is realized, and the topology relationship of the station area can be accurately identified in a short time. It shows that the technology is practical and effective, and can meet the needs of engineering application.