The invention relates to a preparation method of an enteromorpha health care beverage. The preparation method comprises the following steps: (1) washing enteromorpha and drying and grinding enteromorpha, thus preparing enteromorpha powder; (2) weighing the enteromorpha powder, hawthorn fruit, gingers, dried yeast powder, distiller's grains, roses, flowers of kudzuvine, sweet osmanthus flowers, rock sugar, chamomile, forget me not, barbary wolfberry fruit, Pu'er tea, dwarf lilyturf tuber, dried tangerine peel, honey and sodium benzoate according to a ratio; (3) fermenting steamed enteromorpha, hawthorn fruit and gingers; (4) decocting the roses, the flowers of kudzuvine, the sweet osmanthus flowers and the rock sugar with slow fire until thick juice is obtained; (5) soaking chamomile, forget me not, barbary wolfberry fruit, Pu'er tea, dwarf lilyturf tuber and dried tangerine peel at 70-80 DEG C and collecting a soak solution; (6) carrying out filling and sealing. The preparation method has the advantages that not only can wastes be turned into wealth but also the prepared enteromorpha health care beverage has the health care effects of harmonizing blood and nourishing the stomach, soothing the liver and relieving depression, enriching and nourishing blood, strengthening muscles and bones, nourishing and enhancing the immunity.