The invention provides a welding-free quick-locking adjustable cable parameter testing device. The welding-free quick-locking adjustable cable parameter testing device comprises a radio frequency connector, a connecting sleeve, a spring, a tail shell, a conical bearing and a bayonet screw; the radio frequency connector comprises a first outer conductor, an inner conductor, a medium, a medium guide sleeve and a second outer conductor, the inner conductor is fixedly arranged in the first outer conductor through the medium, the end part of the medium is provided with the medium guide sleeve, the medium guide sleeve is plugged by the medium and arranged in the second outer conductor, and the end part of the second outer conductor is provided with contacts and a plurality of groups of slots located between the contacts; a key groove is further formed outside the first outer conductor, a round clamping groove is formed in one end of the key groove, and the bayonet screw corresponding to the key groove is connected to the connecting sleeve; the tail shell is connected to the end of the connecting sleeve in an internal threaded manner, the conical bearing is assembled and connected into the tail shell, and a spring abutting against the end of the first outer conductor is further connected into the connecting sleeve. According to the invention, the rapid locking can be realized, the damage to the cable is smaller, and the stability and reliability are higher.