The invention discloses a construction method for pouring a round-table-shaped grout stop pad in kilometer vertical shaft grouting water-control construction process, comprising the following steps: shaft pouring water treatment, building a water filtering layer, installing a water collecting well and a waterproof layer, installing and fixing a grouting guiding pipe, and pouring a concrete grouting pad, wherein in the step of shaft pouring water treatment, grouting is carried out behind the wall; for the step of installing the water collecting well and the water filtering layer, a space with certain volume is preserved at the medium and upper part of the water filtering layer for installation of a bottomless water-filtering wood tank, then, the steps of paving felt, pouring cement mortar and building a layer of bricks are carried out at the upper part of the water filtering layer from bottom to top in sequence; and in the construction of pouring the concrete grouting pad, the grouting pad and the well wall are tightly fitted through pouring. In the whole construction process disclosed by the invention, the bearing capability of the well wall is fully utilized to confine an aquifer so as to ensure that grout is poured into fractures of the aquifer by using maximum grouting pressure, thus the grouting water-plugging effect under high water pressure and high grouting pressure is ensured in a kilometer vertical shaft construction process, the thickness of the grouting pad is reduced to the maximal extent, and the grouting construction speed is increased.