A coaxial cable connector assembly includes a bracket defining an upright locating plate and a horizontal holder plate, a coaxial cable connector fastened to the upright locating plate for the connection of a coaxial cable, and a grounding wire connector consisting of an externally threaded male connector member and an internally threaded female connector member and fastened to the horizontal holder plate to hold a grounding wire for discharging of magnetic waves, surge or shocks occurred during signal transmission through the coaxial cable to avoid system damage and to assure signal transmission stability.