The invention relates to a lower stopping assembly of a quickly-unzipped zipper. The lower stopping assembly of the quickly-unzipped zipper comprises a box body, a left zipper belt and a right zipper belt, wherein the box body is a flat box body of which the bottom end is closed, while the top end is provided with an open hole; an upward extending box rod is integrated on the left half side of the box body; an insertion hole is formed on the right side of the box rod of the box body; a split groove which stretches from the top down and is communicated with the insertion hole is formed on the right side wall of the box body; the upper half section of the split groove is further widened into a lateral separating groove of which the width is slight larger than the diameter of an insertion rod; the bottom end of the left zipper belt is integrally connected with the box rod; the insertion rod which can be inserted into the insertion hole is arranged at the bottom end of the right zipper belt; and a flat part which can be inserted into the split groove is arranged on the outer side of the insertion rod.