We have been conducting a huge scale analysis for the full-wave electromagnetic field using the finite element method on various kinds of massively parallel supercomputers, such as K Computer and Fugaku in Japan.Through the whole simulation task including its pre- and post-processing, however, now the mesh generation step becomes the clear bottleneck. Currently, we are developing a fast and robust tetrahedral mesh generation technique based on the combination of quad/oct-tree and advancing front method. De-tail of the mesh generation algorithm will be explained and some examples of huge scale mesh generation will be demonstrated in the presentation.