The invention discloses an electrical connector assembly, which comprises a metal shell, a circuit board accommodated in the metal shell, a cable which is electrically connected with the circuit board and backwardly extends out of the metal shell, and an unlocking mechanism which is arranged on the metal shell in the forward and backward direction, wherein the unlocking mechanism comprises a locking piece which can rotate up and down, a spring which vertically abuts against the front end of the locking piece, a sliding piece which downwardly abuts against the back end of the locking piece and can move forward and backward to drive the locking piece to rotate up and down, a drawing piece which is connected with the sliding piece and positioned outside the metal shell, and a downwardly protruding locking hook is arranged at the front end of the locking piece, inwardly retracts into the metal shell or inwardly protrudes out of the lower surface of the metal shell along with the up and down rotation of the locking piece. The parts of the unlocking mechanism of the electrical connector assembly provided by the invention are skillfully matched, and the electrical connector assembly is reasonable and simple, is simple to operate and has the advantages of time and labor saving.