The invention discloses a precipitation closure device, comprising a steel sleeve and a closing cap, wherein the external wall of the steel sleeve is welded with an upper water stop ring and a lower water stop ring, and the lower part of the steel sleeve is provided with a plurality of through holes; the closing cap comprises a lower steel plate, an upper steel plate, a handle and a water swelling stop ring; the upper steel plate is sheathed on the handle, the bottom end of the handle is welded in the center of the lower steel plate, the handle is perpendicular to the lower steel plate, the water swelling stop ring is arranged between the lower steel plate and the upper steel plate, and the diameter of the upper steel plate and the lower steel plate is smaller than the inside diameter of the steel sleeve and is matched with the steel sleeve. The precipitation closure device has the advantages of simple structure as well as convenient and basic construction.