An electrical connector includes an insulating housing, a plurality of electrical terminals integrated in the insulating housing, a shielding shell, an external housing and a water-proof assembly. The shielding shell is worn around the insulating housing and has a bottom plate opened with a pair of through slots. The external housing is molded outside the insulating housing and the shielding shell, and has a bottom wall defined with a pair of through holes which are corresponding to the through slots. The water-proof assembly is embedded in the bottom of the external housing and has a pair of elastic arms elastically project upward through the through holes of the external housing and the through slots of the shielding shell.