The invention relates to a process to extrude a high lug boss in a through hole of a sheet metal, in particular to a process to extrude a high lug boss in a through hole of a sheet metal through cold extrusion, wherein, the height of the lug boss is greater than the thickness of the sheet metal. The technology of the invention adopts a fine blanking machine, which is not stressed uniformly in three directions, to directly cold squeeze the sheet metal, thus improving the plasticity of the metal, impeding the intergranular deformation of materials and changing intergranular deformation into intragranular deformation; the tensile stress can be greatly inhibited, thus preventing the emergence and expansion of cracks and further avoiding the problem of large displacement in the prior art, which causes excess tensile force, easy breaking and tension fracture of the lug boss, etc.