Self-centering rotatable clamp

The invention discloses a self-centering rotatable clamp. The self-centering rotatable clamp comprises a finger clamping head, a clamp finger, a transmission angle piece, a clamp body, a guiding rod sleeve, a spring guiding rod, a spring, a clamp base, a bearing and a gear, a U-shaped groove is formed in the finger clamping head, and the finger clamping head is connected with one end of the transmission angle piece through the clamp finger; an opening groove is formed in the lower part of the clamp body, and the middle of the transmission angle piece is rotatably arranged in the opening grooveof the clamp body through a pin; the two ends of the guiding rod sleeve are connected with the clamp body and the clamp base correspondingly, and the spring guiding rod is mounted in the guiding rodsleeve in an up-down moving mode, and the top end of the spring guiding rod is connected with the other end of the transmission angle piece, and the spring is arranged between the tail end of the spring guiding rod and the cla