An electrical connector socket includes an insulating base, a first group of signal terminals, a second group of signal terminals, and a third group of signal terminals. The first group of signal terminals includes first terminals for transmitting a first signal. The second group of signal terminals includes second terminals and third terminals, and the second terminals and the third terminals are used for transmitting a second signal. The third group of signal terminals includes fourth terminals, the second terminals are located between the first group of signal terminals and the third group of signal terminals, the fourth terminals are used for transmitting a third signal, and the first group of signal terminals and the third group of signal terminals are used for transmitting a fourth signal.