The invention relates to a method for quantificationally measuring the stratum water producing rate. The method comprises the following steps that stratum sampling samples and slurry filter liquid samples are collected; the stratum sampling samples comprises crude oil, stratum water and slurry filter liquid, oil type samples and water type samples are obtained after the stratum sampling samples are separated, and the water type samples comprise stratum water and slurry filter liquid; the volume of the obtained oil type samples is the volume of the oil type samples under the ground condition, and the volume of the obtained water type samples is the volume of the water type samples under the ground condition; the volume factor of the oil type samples is obtained, the volume factor of the oil type samples is multiplied by the volume of the oil type samples under the ground condition, and the volume of the oil type samples under the stratum condition can be obtained; the volume of the stratum water in the water type samples is calculated on the basis of the concentration of K<+> in the slurry filter liquid samples and the concentration of K<+> in the water type samples; the volume factor of the stratum layer is obtained, the volume factor of the stratum water is multiplied with the volume of the stratum water in the water type samples, and the volume of the stratum water under the stratum condition is obtained; and the stratum water producing rate is obtained.