The present utility model discloses a connector, and a male pin and a female pin thereof. Shortages that the prior connector can not be arranged in small space or can not be applied to high temperature and high pressure environments can be overcome. The male pin comprises an alternating current cable welding led out from a first insulator, a signal cable welding cup which is arranged on the outer surface of the first insulator and led out from a first side of a second insulator, and wrapped by the second insulator from the outside and stretched out of the end face of the second insulator, and a connecting part which is arranged on a second side of the second insulator and is thicker than the second insulator; a sealing ring groove is arranged between the connecting part and a first side of the installing part; a second side of the installing part is provided with a watertight head, and the second side is opposite to a first side of the watertight head; and a signal contacting point and an alternating current contacting points are led out from a second side of the watertight head. The coaxial connector is small in diameter, can be arranged on a side wall of a following drilling instrument, and can work normally under environments of 140 MPa slurry pressure and 150 DEG C high temperature.