Abstract: In view of the magnetic saturation problem that may exist in the magnetic shield in the low-frequency pulsed magnetic field environment, the magnetic saturation effect study was carried out by using the test method. It is confirmed that the conventional engineering shield can reach the magnetic saturation state in the low-frequency pulsed magnetic field environment. The magnetic saturation law was obtained by observing the change of the shielding effectiveness of the shield, and the influence of the magnetic saturation effect on the shielding effectiveness was analyzed in relation to the material permeability of the shielding body, the thickness of the shell, the external dimensions and other parameters. Studies show that the low-frequency pulsed magnetic field can make the shield reach a state of magnetic saturation, and the shielding effectiveness of the magnetic shield shows obvious dynamic change characteristics, and has a similar change trend to the permeability of the shield shell; For a shield with a shell thickness of less than 2 mm and a length, width and height of about 2 m×2 m×2 m, in a magnetic field environment with a rise time of 300 μs and a duration time of 1.2 ms, the magnetization field strength to reach magnetic saturation is about 10 mT, and the degree of magnetic saturation has a negative correlation with the magnetic permeability and external dimensions, and has a positive correlation with the thickness of the shell. The research results are consistent with the theoretical analysis conclusions, which can provide references for the scientific and reasonable design of magnetic shields and have high engineering application value.