Studying the effective restoration of power supply to power outage areas in a distribution network containing distributed generation under fault isolation conditions is beneficial for the stable operation and reliable power supply of the distribution network. Replacing the interconnection switch with a Soft Open Point in the fault recovery process of the distribution network can provide voltage support to the DG while transferring the load. Due to the existence of SOP, the original single-sided power supply reclosing has been transformed into double-sided power supply reclosing. When the voltage on both sides of the circuit breaker is inconsistent, a surge current will be generated, and excessive reclosing surge current will affect the safe and stable operation of the distribution network. This article provides a detailed analysis of the causes of surge current generated during the circuit breaker reclosing process, and presents a simplified calculation method for the maximum surge current. The effectiveness of the surge current calculation method is demonstrated by building a simulation model on the MATLAB/Simulink platform; Based on this, the impact of closing surge current on system side current protection was analyzed, and the necessity of studying ways to reduce closing surge current was verified. At the same time, it provided a basis for evaluating the consumption capacity of distributed power sources in distribution networks.