The invention discloses an electrical connector. The electrical connector comprises a female connector and a male connector, wherein the female connector comprises a first cylindrical shell and at least three electric conductors, one end of each electric conductor is arranged inside the shell, blind grooves are formed in the first shell and arranged symmetrically, a jack is limited between two arbitrary electric conductors, the cross section of the jack is gradually reduced from top to bottom to form a three-dimensional trapezoidal structure with a large upper part and a small lower part, the male connector comprises a second cylindrical shell and at least three insertion sheets, one end of each insertion sheet is arranged inside the second shell, the inner diameter of the second shell is slightly larger than the external diameter of the first shell, bulges matched with the blind grooves are arranged on the second shell, the quantity of the insertion sheets is the same as the quantity of the jacks, and the insertion sheets are of the three-dimensional trapezoidal structures matched with the jacks so that the male connector and the female connector can be plugged with each other. The electrical connector disclosed by the invention has the advantages of connection stability, long service lifetime and the like, directional plugging can be achieved, and misplug can be prevented.