The invention discloses a salvia miltiorrhiza compound hypotensive capsule and a preparation method thereof. The capsule is prepared from the following components in percentage by weight: 18-20 percent of salvia miltiorrhiza, 8-10 percent of radix cyathulae, 8-10 percent of herba leonuri, 10-12 percent of moutan bark, 10-12 percent of semen raphani, 8-10 percent of dandelion, 8-10 percent of scutellaria baicalensis, 8-10 percent of earthworm, 6-8 percent of eucommia ulmoides and 6-8 percent of radix paeoniae alba. The preparation method comprises the steps of concentrating and drying, preparing a soft material, granulating, drying, straightening, sterilizing and packaging so as to prepare the hypotensive capsule. The salvia miltiorrhiza compound hypotensive capsule has excellent effects that the coronary artery can be effectively dilated, the coronary blood flow can be increased, and the heart rate can be regulated to recover vascular reaction and blood flow velocity to be normal, so that the angina can be relieved, and normal blood tension can be recovered. Compared with traditional western medicines, the salvia miltiorrhiza can avoid toxic and side effects of treatment by traditional western medicines, complies with the idea of traditional Chinese medicine on treating hypertension, and is capable of remarkably reducing incidents of cerebral apoplexy and heart disease, remarkably improving the living quality of patients and effectively reducing the burden for treating diseases.