An electrical plug connector includes an insulated housing, a plurality of upper-row plug terminals, a plurality of lower-row plug terminals, and a rear positioning block. The insulated housing includes a rear assembling portion defined at the rear of the insulated housing. The rear positioning block is assembled to the rear of the insulated housing. The rear positioning block includes a plurality of through holes and a buckling portion. The through holes are defined through the rear positioning block from the front to the rear. The rear of the upper-row plug terminals and the rear of the lower-row plug terminals respectively pass through the through holes. The buckling portion is defined at the front of the rear positioning block. The buckling portion is adapted to be mated and engaged with the rear assembling portion.