The invention discloses blood pressure-lowering health soybean milk and a preparing method thereof. The health soybean milk comprises the following raw materials in parts by weight: 60-70 parts of red beans, 45-50 parts of sticky rice, 30-40 parts of natto, 35-40 parts of lotus root starch, 15-20 parts of cauliflowers, 15-20 parts of tomatoes, 5-6 parts of honey dew melons, 9-10 parts of hericium erinaceus, 2-4 parts of jade butterfly seeds, 4-6 parts of gynostemma pentaphylla, 1-2 parts of ligustrum dela-vayanum hariot, 2-4 parts of felwort, 0.5-1.0 part of evening primrose, 8-10 parts of mashed jujube flesh, 2-4 parts of prickly pear, 3-4 parts of bilobalide, 1-2 parts of trans-fatty acids, 12-16 parts of dark plum juice, 30-35 parts of honey and a proper amount of water. The health soybean milk disclosed by the invention is simple in preparing method, convenient to operate, clear, transparent, fragrant and tasty and has the effects of refreshing and quenching thirst, and the added heath Chinese herbal medicines can be used for achieving the effects of cooling blood, lowering blood pressure, clearing heat, removing heat from liver and the like and are suitable for patients suffering from vascular hypertension to be used for lowering the blood pressure.