The bucking principle is to make use of the elastic force of the metal hook piece of the watch case cover and the fixed pin of the folding piece to balance the elastic force and buckle. The utility model has the advantages that the two sides of the case cover of the watch belt are provided with the multi-level band end pin connecting holes, which are convenient for micro adjustment of the length of the watch belt; the wearing and use are convenient, the buckle is stable and durable, and the service life is long; and the stability degree can be adjusted. The disadvantage is that the buckle piece is wide and the interface edge is convex, which affects the smoothness and beauty of the watch strap.
