The invention discloses a full process for preparing hawthorn and walnut milk drink by taking hawthorns and walnuts as raw materials, adding white granulated sugar, polyglycerol fatty acid ester, xanthan gum, sodium bicarbonate, an antioxidant, sodium cyclamate and a softening agent and performing husking, selecting, cleaning, peeling, soaking, grinding, mixing, homogenizing, filling and sterilization, the natural nutritional components and the effects of the hawthorns and the walnuts are retained, and the hawthorn and walnut milk drink is plant protein drink which tastes sweet and sour, is fresh and cool in mouthfeel, is rich in unsaturated fatty acid, flavonoids, various vitamins and various organic acids such as tartaric acid, citric acid, maslinic acid and malic acid, can assist in digestion, tonify spleen and stomach, has obvious effects of expanding blood vessels and reducing pressure, has the functions of enhancing myocardium, resisting arrhythmia and adjusting blood fat and cholesterol content, and is beneficial for patients suffering from hyperlipidemia and hypertension, thereby being certainly popular among people.