Abstract: With the development of digital twin technology, it is more convenient for equipment in power grid to acquire monitoring data online. Therefore, using measured data to analyze the safety of equipment operation will become an important application of digital twin technology. This paper proposes a switching transient overvoltage modeling method for circuit breakers in distribution networks based on measured data. Through collecting the actual operation data of the 10 kV distribution network circuit breaker, the key operation parameters of the circuit breaker are extracted and the model parameters are iterated and modified accordingly. Moreover, the simulation model can reflect the status of the current operating equipment and improve the reliability of the analysis results. The simulation results show that the maximum distribution overvoltage calculated by this model is 3.88, and it is closer to the measured value compared with the traditional model. This model can be used to analyze the operation safety of distribution network circuit breaker.