The current distribution of the capacitor element stack is simulated using an anisotropic material model. Taking the capacitor as an example, the magnetic quasi-static field simulation technology of the stacked structure is studied, and the structure of the film-aluminum foil composite medium of the capacitor element is analyzed, and the skin effect in different directions is obtained when the alternating current flows through the element. In the direction perpendicular to the stacking plane, the current is the displacement current, and in the direction parallel to the stacking plane, the current is the conductive current, so the skin effect occurs parallel to the stacking direction. The research shows that the parameters such as resistance and inductance of the multi-layer stack structure can be calculated macroscopically by using anisotropic materials, and the current distribution law can be obtained, and the accuracy of the results can meet the requirement of engineering.