The invention relates to medicine and food preparation technology, and aims to provide the application of dendrobium officinale leaves, sealwort and radish seeds in the preparation of medicines for treating hypertension. Including: take dried leaves of Dendrobium officinale, 1-25 parts of sealwort, or 1-25 parts of raisin seeds, heat water to extract twice, combine the two extracts and then concentrate; grind the leaves of Dendrobium candidum to fine powder, Add to the combined extract; Add excipients according to the conventional pharmaceutical processing method to make various dosage forms of drugs for the treatment of high blood pressure, food and medicine homologous food with the function of treating high blood pressure, or health food with the function of lowering blood pressure . In the present invention, the Polygonatum water extract is used in conjunction with Dendrobium officinale leaves, and its antihypertensive effect is greatly improved. Dendrobium officinale leaves are directly used as medicine after "grinding into fine powder". The utilization of medicinal ingredients is more complete than traditional methods such as water extraction, which is beneficial to the improvement of antihypertensive effect. Combined with radish seed water extract, it can achieve both qi and yin supplements, while promoting qi and lowering qi, nourishing without stagnation, and improving the curative effect.