The invention discloses a method for quantitatively expressing diagenetic logging facies of a sandstone reservoir. The method for quantitatively expressing the diagenetic logging facies of the sandstone reservoir can used for accurately evaluating a longitudinal phase sequence of diagenetic facies of a non-coring well sandstone reservoir, and plane distribution and principle of diagenetic facies of a target stratum reservoir by utilizing quantitative indexes of typical stone electrical parameters for reflecting diagenetic characteristics and environment of the sandstone reservoir, so as to provide effective technical information for the exploration and development of oil and gas of sandstones; a favorable block for the exploration and development of the oil and gas of the sandstones is preferably selected, so that the predication accuracy of the favorable block is improved, the success rate of the exploration and development is improved and the cost of the exploration and development is reduced.