A quick self-locking thread coupling connector interface with an inner contact inside the insulator, the insulator inside the outer contact, the coupling nut has at least one convex tooth and a first protruding part on the inner side, the elastic claw has slots corresponding to the convex teeth, a second protruding part and thread are provided on the outer side and the inner side of the elastic claw. The outer contact and the cable connector body are connected fixedly, the elastic claw surrounds rotatably outside the outer contact and is limited axially at the left end by the outer contact. The push nut surrounds the cable connector body and is limited axially, the elastic component is located between the elastic claw, the push nut, and props against the elastic claw and the push nut. The coupling nut surrounds the elastic claw and is connected fixedly with the push nut.