The invention discloses a novel algae fermented beverage based on comprehensive utilization of marine green tide algae enteromorpha suddenly gathered, satisfies the demands of people to a healthy, nutritious and delicious beverage, and develops an effective way for comprehensively using the enteromorpha resource. The enteromorpha fermented beverage is fine and smooth, uniform, has no precipitate and no layer, is light green in color, has full-bodied enteromorpha aroma and fermented aroma, is sour and sweet, palatable, has no fishy smell and other peculiar smell, total sugar content of products is not lower than 10% and total acid content is between 0.65% to 0.70%, the beverage has the following advantages: (1) the fermented beverage uses enteromorpha as a fermentation matrix; the enteromorpha is rich in nutritive substances such as carbohydrate, protein, crude fiber, mineral substances, fat, vitamin and the like, so that the trophism and the functionality of the fermented beverage are improved; (2) desalination, color protection and deodorization are performed on the enteromorpha, so that the active nutritive substances in the enteromorpha and the fresh algae smell of the enteromorpha are retained, and the product palatability is improved; (3) raw materials of products are added with cane sugar, honey and sodium benzoate, so that the fermented beverage is sour and sweet and palatable, has no fishy smell and other peculiar smell.