Abstract: In order to explore the effect of a pulsed magnetic field on the removal of Al2O3 inclusions in steel, this paper carries out smelting experiments by using an intermediate frequency induction furnace. Then, numerical simulation of the flow field of molten steel and the removal of inclusions of different sizes under the action of the pulsed magnetic field is carried out through the software COMSOL multi-physics field. Combining the numerical simulation results with the experimental results, the removal mechanism of Al2O3 inclusions in steel under the pulsed magnetic field is discussed. The experimental results show that, after the pulsed magnetic field treatment, the total content of Al2O3 inclusions in steel decreases, the percentage of small-sized Al2O3 inclusions decreases, and the percentage of larger-sized Al2O3 inclusions increases, which indicates that the pulsed magnetic field promotes the removal and the collision growth of Al2O3 inclusions. The numerical simulation results show that, when the pulsed magnetic field is applied, upper and lower double circulations form in the molten steel, which promotes the removal of inclusions. The larger the size of inclusions is, the higher the removal efficiency will be. Meanwhile, most of the inclusions are separated to the wall surface, which is consistent with the experimental results.