An electrical connector includes a base and a fixing assembly. The assembly includes a shaft, at least one positioning post, and at least one connecting bar. The shaft is slidably connected to the base and able to slide toward a first direction. The at least one positioning post is slidably connected to the base and able to slide toward a second direction. A threaded pole protrudes from each of the at least one positioning post. Ends of each of the at least one connecting bar is rotatably connected to the shaft and one of the at least one positioning post, respectively. The sliding of the shaft toward the first direction causes the at least one positioning post to slide toward the second direction, and when the shaft is caused to slide from a first position to a second position, the at least one threaded pole engages another electrical connector.