As described above, the front ends of the extending portions 22 of the plurality of the conductive terminals 20 are exposed to the at least one docking surface 101 of the insulating housing 10, the surface of the front end of the extending portion 22 of each of the plurality of the conductive terminals 20 exposed out of the insulating housing 10, and adjacent to and projecting beyond the front surface of the at least one sealing board 43 is coated with the layer of the insulation ink by the pad printing technology to form the insulation layer 24, after the electrical connector 100 is interconnected with the docking connector frequently, the metal scraps are produced from the at least one sealing board 43 on account of the friction between the at least one sealing board 43 and the docking connector, the metal scraps will be fallen off on the insulation layers 24 of the plurality of the conductive terminals 20 of the electrical connector 100, so that the metal scraps will be without connecting each of the plurality of the conductive terminals 20 with the shielding element 40 for isolating each of the plurality of the conductive terminals 20 from the shielding element 40, and the metal scraps will be without connecting the plurality of the conductive terminals 20 for isolating the one of the plurality of the conductive terminals 20 from the other conductive terminals 20. As a result, a short circuit of the electrical connector 100 is prevented from being caused by the metal scraps.