The invention discloses a skull lock, which comprises an upper lock piece, a lower lock piece and a lock core, the lock core can fix the relative position between the upper lock piece and the lower lock piece, and the lock core passes through the lower lock piece and the upper lock piece in turn , the end of the lock cylinder close to the lower lock piece forms a stopper, which is the big end of the bolt, and the stopper stops on the side of the lower lock piece back to the upper lock piece, so that one end of the lock cylinder is fixed on the lower lock piece, and the outer surface of the lock cylinder There are teeth facing the lower lock plate, and the teeth on the outer surface of the lock cylinder are clamped into the upper lock plate, so as to enhance the locking force, the uniformity of the locking force and the quickness of locking, and reduce the operation time. The skull lock has a simple structure, can be quickly locked, has a better locking effect, and is not easy to fall off.