A lower stop of a zipper comprises a male stop formed by a lower portion and a high portion. An upper inner side of the lower portion has a downward hook and an upper top of the hook has a recess. One side of the recess has a stopper. A lower end of the downward hook is formed with an inclined groove; and a female stop has a buckle at an upper portion thereof and a block-like embedded seat at a lower portion thereof. An inner lateral wall of a top of the buckle is an upward protrusion and an upper side of the upward protrusion has cambered slot. An embedded groove penetrates through the embedded seat. An inner lateral wall of the embedded seat has a sliding groove which is communicated with the embedded groove.