The invention relates to a method for measuring the mineralization degree of stratum water. The method comprises the following steps that a, stratum sampling samples and slurry filtering liquid samples are collected; b, the mixing quantity of slurry filter liquid in the stratum sampling samples is calculated according to the concentration of K<+> in the stratum sampling samples and the concentration of K<+> in the slurry filter liquid samples; c, the mineralization degree of the stratum water is calculated on the basis of the mineralization degree of the stratum sampling samples, the mineralization degree of the slurry filter liquid samples and the mixing quantity of the slurry filter liquid in the stratum sampling samples. The measuring method provided by the invention only needs several hours, the actual effect is high, and in addition, the cost is low. The measuring method provided by the invention realizes the effects that the mineralization degree of the stratum water is accurately known in the exploration well logging stage, the basic parameters are provided with the reservoir stratum well logging explanation and evaluation, fast decision is provided for the exploration period, and the method can be widely used for various kinds of maritime and onshore oil and gas fields.