This invention discloses a stacked electrical connector including a first connector, a second connector, and a conductive casing. The first connector includes a first signal connection portion and a first group of soldering pins extending along a direction. The second connector includes a second signal connection portion and a second group of soldering pins extending along the direction. The first connector is stacked on the second connector. The conductive casing has a first opening, a second opening, and a third opening. The conductive casing covers the first connector and the second connector. The first signal connection portion passes through the first opening, and the second signal connection portion passes through the second opening. The first group of soldering pins and the second group of soldering pins are exposed to the third opening.