The thread-locking machine uses threading needles (stitches) and crochet needles (crochet needles) to form a group at intervals. The thread-locking machine introduces the yarn into the middle of the bookmark along the stitch. The crochet claw (hook claw or CR) pulls the thread to the position where the crochet needle descends. The crochet uses the slot hook to hook the yarn and twist 180 degrees up and pull it down from the bookmark to the outside of the stitch to form a stitch to form a loop, in the use of crochet torsion to make the loop automatically into a knot to form a braid knot, the posts are tightly locked to each other, after the flat lock book is locked, the yarn is in the middle of the book post, and the loops and knots of the locking machine are regularly arranged into a braid knot of flat glue on the outer crease of the book post.