In daily life, power equipment often needs to carry out maintenance, and then need to open and close the power line, the power transformer will produce high amplitude, harmonic rich excitation current, which will have a negative impact on the power line. At present, the research on the suppression method of transformer excitation inrush current mostly has the shortcomings of low economy and only staying at the simulation level, etc. This paper proposes a method of excitation inrush current suppression based on the remanent magnetization integral algorithm. In this paper, the residual magnetization integral algorithm is used to calculate the residual magnetization of the transformer, and then control the closing sequence of the circuit breaker to inhibit the generation of excitation inrush current. Test experiments, practical experiments show that the method can reliably inhibit the excitation inrush current, so that the equipment can be closed smoothly. This paper to real-time voltage data on the calculation of remanent magnetization, so that the reliability of the method is greatly improved, while reducing the number of operations of the actual closing test, to ensure the reliable operation of the power system.