An electrical connector comprising: a shell, zinc alloy shell body, front rubber core, rubber plug and wire; said zinc alloy shell body is provided with a holding groove penetrating from the front to rear ends; the front rubber core and the rubber plug are installed inside the zinc alloy shell body, and the shell set externally onto the zinc alloy shell body; the electric connector is provided with a hook unit, which penetrates the front rubber core, and is also coupled with the zinc alloy shell body; at the rear end of said hook unit, a locating part is molded, and also locked at the threading section of the wire. Compared with prior arts, the utility model features excellent air-tightness, anti-EMI capacity and compactness, thus improving the signal transmission capacity of the electric connector.