To address the issue that existing non-invasive current distribution sensing methods cannot intuitively display the internal current distribution imaging results of Press Pack IGBTs, this paper proposes an electromagnetic inversion imaging method based on numerical solutions. First, a linear equation system formed by the magnetic field measured at external magnetic measurement points and the virtual currents inside the device is established. However, due to the number of magnetic measurement points being far fewer than the number of virtual currents, and the coefficient matrix of the linear equation system being nearly singular, the solution process exhibits severe ill-posedness and instability. To solve the problem of solving the linear equation system, a classical method for solving inverse problems, the Tikhonov regularization algorithm, is introduced to solve the system. Ultimately, a highly refined virtual current distribution map is obtained, where the virtual current distribution in the map closely matches the pre-set current distribution. This provides an effective theoretical reference for fault prediction during the operation of Press Pack IGBTs.