The invention discloses pills for treating a rheumatic heart disease and a preparation method thereof and belongs to the field of traditional Chinese medicines. Active ingredients of the pills comprise: by weight, 50 to 70 parts of cassia twig, 50 to 65 parts of mix-fried licorice root, 45 to 60 parts of dwarf lilyturf tuber, 45 to 60 parts of Chinese magnoliavine fruit, 40 to 55 parts of poria cocos, 40 to 50 parts of mix-fried milkvetch root, 40 to 50 parts of curcumae, 35 to 45 parts of pubescent holly root, 35 to 45 parts of red sage root, 30 to 40 parts of Chinese arborvitae kernel, 25 to 40 parts of snakegourd fruit, 20 to 30 parts of longan pulp, 20 to 30 parts of sichuan lovage rhizome, 15 to 30 parts of stir-fried milkwort root, 15 to 25 parts of grassleaf sweetflag rhizome and 10 to 25 parts of syzygium jambos seed. The pills utilizes the unique traditional Chinese medicines, has a good formula, has effects of tonifying qi, nourishing yin, dispelling wind, dissipating heat, relaxing muscles and tendons, invigorating the circulation of blood, strengthening vital qi and eliminating pathogens, and has good absorption effects, obvious curative effects, no toxic and side effect and no adverse clinical reactions. A clinical experiment proves that the pills have good effects of treatment on a rheumatic heart disease, and postoperative recovery.