An electrical connector assembly includes: a circuit board; a connector, located in front of the circuit board and electrically connected to the circuit board; a chip, provided on the circuit board, and electrically connected to the circuit board; a metal shell, covering the connector and the circuit board; and an inner film, made of a high heat conductive material, and wrapping the chip and the circuit board. At least a part of the inner film is located between the metal shell and the circuit board. When the chip generates a great amount of heat, the inner film, serving as a medium, can absorb the heat rapidly and conduct the heat to the metal shell so as to dissipate the heat outside.