An electrical connector includes an insulative column housing (100) having a wire connection base (110) with a receiving slot (111) formed at a rear thereof; a plurality of terminals (200) embedded inside the insulative column housing (100) and having a piercing cutter (210) on one end thereof respectively to penetrate into the receiving slot (111) along an axial direction of the insulative column housing (100); and a wire organization base 300 penetrating into the receiving slot (111) along the axial direction of the insulative column housing (100) and having a plurality of wire plug-in slots (310) corresponding to the piercing cutters (210) such that the wire plug-in slots (310) arranged perpendicular to the piercing cutters (210) corresponding. Accordingly, the wire organization base (300) clamps and secures the wires (11) therein in advance to allow the wires (11) to electrically connect to the corresponding terminals (200).