The invention discloses a bowel-relaxing traditional Chinese medicine capsule and a preparation method thereof. The capsule is prepared by raw materials in parts by weight as follows: 15-20 parts of momordica grosvenori, 10-15 parts of tangerine peels, 5-10 parts of semen cassiae, 10-15 parts of semen coicis, 10-15 parts of angelica sinensis, 5-10 parts of pine nut kernels, 6-12 parts of cistanche, 10-15 parts of semen raphani, 12-16 parts of fructus cannabis, 14-18 parts of hawthorns, 5-10 parts of rheum officinale, 7-13 parts of burdock leaves, 10-15 parts of immature bitter oranges, 12-16 parts of rhizoma smilacis glabrae, 16-22 parts of roots of straight ladybell, 10-15 parts of common anisodus, 15-20 parts of common yam rhizome, 10-15 parts of scutellaria baicalensis, 5-10 parts of bighead atractylodes rhizome, 10-15 parts of wax gourd pulp, 6-12 parts of radix polygonati officinalis, 5-10 parts of polygonum multiflorum, 10-15 parts of semen pruni, 5-10 parts of snake gourd seeds, 8-14 parts of sweet potato leaves, 6-12 parts of peach blossoms and 10-15 parts of manglietia fordiana fruit. The capsule has effects of relaxing bowels, nourishing yin, moistening dryness, promoting production of body fluid, nourishing lung, benefiting qi, nourishing blood, removing retention, guiding stagnation, clearing heat and purging fire, has an obvious effect on treating constipation, and is quick in effect, short in treatment course, high in cure rate, free of dependence, free of any side effects and adverse reactions, low in cost, convenient to take and completely economic.