An electrical plug connector includes an insulated housing, a plurality of terminals, a metallic shell, and a positioning plate. The insulated housing includes a base portion, an upper portion, and a lower portion. The upper portion and the lower portion are extending from one side of the base portion. A mating room is between the upper portion and the lower portion. The terminals are held in the insulated housing. The metallic shell includes a tubular portion and a receiving cavity defined in the tubular portion. The insulated housing is received in the receiving cavity. The positioning plate is at the rear of the metallic shell to enclose the base portion. The positioning plate includes a first leg and a second leg respectively located at two sides of the base portion, so that the positioning plate can be assembled with a circuit board stably.