A pore-throat dimension distribution identification method for sandstone reservoirs is provided. The method includes saturating reservoir sandstone to be identified with water to obtain water-saturated reservoir sandstone samples, separately centrifuging the samples at different centrifugal rotational speeds, performing nuclear magnetic resonance analysis respectively to obtain sandstone samples with different fluid saturation degrees and T2 relaxation time having different values, converting the T2 relaxation time into a pore dimension congruent distribution spectrum, and subjecting the processed sandstone samples to high-pressure mercury injection analysis to acquire ratios of different throat dimensions to volumes of communicated pores, thus further acquiring pore-throat dimension distribution of the reservoir sandstone to be identified. By the technical scheme of the method, pores and throats of a dense sandstone reservoir are effectively identified, distribution of the pores and the throats are evaluated quantitatively, and bases are provided for objectively evaluating available geological reserves of oil and gas reservoirs, predicting a recovery efficiency and making a reasonable development policy.