A push-pull coaxial connector includes: an external conductor configured to internally receive the matching external conductor of a mating connector, with concave parts or through holes on the inner surface of the side wall of the external conductor; a sleeve surrounding the external conductor, where the sleeve is able to slide between the front position and rear position along the external conductor and is able to rotate around the circumference of the external conductor. When the sleeve is at the front position, one or more protrusions are staggered away from one or more notches and abutted on the rear surface of the sleeve to prevent the sleeve from moving backward. When the sleeve is at the rear position, one or more protrusions are received in one or more corresponding notches.