The invention discloses traditional Chinese medicine granules for treating senile functional constipation and a preparation method and belongs to the field of traditional Chinese medicines. The traditional Chinese medicine granules are prepared from raw materials of effective ingredients of medicines as follows: radish seeds, Chinese yams, roots of Ficus erecta, largehead atractylodes rhizomes, Ficus esquiroliana, officinal magnolia bark, Chinese fevervine herbs, liquorice roots, perny false fairybells rhizomes, songaria cynomorium herbs, mulberry fruits, peach seeds, Korean pine seeds, corydalis tubers, desertliving cistanche, common anemarrhena rhizomes, pseudostellaria roots, cochinchnese asparagus roots, auriculate cynanchum tubers, bitter apricot seeds, rhizomes of whorledleaf solomonseal, Chinese arborvitae kernels, citron fruits and villous amomum fruits. Medicinal materials adopted by the granules conform to the monarch, minister, assistant and guide principle, and the granules suit the remedy to the case according to the pathogenesis, have effects of tonifying the kidney and the spleen, reinforcing qi, nourishing blood, activating blood circulation, removing blood stasis, nourishing yin, moistening dryness, promoting digestion and purgation, promoting qi circulation, removing qi stagnation and relaxing bowels, are good in absorbing effect, significant in curative effect and free of toxic and side effects and clinical adverse effects, and have the higher cure rate for the senile functional constipation according to clinical verification.