The invention discloses a cable connector assembly. The cable connector assembly comprises a metal case and a cable connector accommodated into the metal case. The metal case comprises an accommodation space and a lock catch groove communicating with the accommodation space. The cable connector comprises a case, an accommodation groove arranged in the case, a lock catch part arranged in the accommodation groove and a driving part capable of driving the lock catch part. The case comprises a front accommodation cavity and a back accommodation cavity along a forward-backward direction. The lock catch part comprises a lock catch hook, an obliquely-extending structure and a pivot shaft extending in a transverse direction. The driving part can perform reciprocating motion in a forward-backward direction and comprises a protrusion matching the lock catch part. When the cable connector is accommodated into the accommodation space, the lock catch hook is locked into the lock catch hole. When the driving part moves backward, the protrusion upwardly applies force upon the obliquely-extending structure such that the lock catch part surrounds around the pivot shaft in order to drive the lock catch hook to downwardly move and steer the lock catch hook away from the lock catch hole. Therefore, the overall cable connector is allowed to withdraw from the metal case.