As described above, front ends of the extending portions of the plurality of the conductive terminals are exposed to at least one docking surface of the insulating housing, a surface of the front end of the extending portion of each of the plurality of the conductive terminals exposed out of the insulating housing, and adjacent to and projecting beyond the front surface of the at least one sealing board is coated with a layer of the insulation ink by a pad printing technology to form the insulation layer, after the electrical connector is interconnected with the docking connector frequently, metal scraps are produced from the at least one sealing board on account of the friction between the at least one sealing board and the docking connector, the metal scraps will be fallen off on the insulation layers of the plurality of the conductive terminals of the electrical connector, so that the metal scraps will be without connecting each of the plurality of the conductive terminals with the shielding element for isolating each of the plurality of the conductive terminals from the shielding element, and the metal scraps will be without connecting the plurality of the conductive terminals for isolating one of the plurality of the conductive terminals from the other conductive terminals. As a result, a short circuit of the electrical connector is prevented from being caused by the metal scraps.