An electrical connector assembly including a plug electrical connector and a receptacle electrical connector is provided. The plug electrical connector includes a first structural member and a plurality of first terminals, and the first terminals are disposed in the first structural member. The receptacle electrical connector includes a second structural member and a plurality of second terminals, and the second terminals are disposed in the second structural member. The first structural member is adapted for docking with the second structural member such that the first terminals are correspondingly inserted and electrically connected to the second terminals.