Provided are a dairy product containing functional alginic acid beads and a preparation method thereof. The dairy product includes a composition containing 1 to 10% of alginic acid beads based on the weight of the dairy product. The alginic acid beads are formed by dropping into a 1.0 to 5.0% calcium lactate solution, a mixed solution including 0.5 to 15.0% by weight of a functional material including vitamin C, vitamin E, iron, omega-3, a water-soluble dietary fiber or a combination thereof, 25.0 to 45.0% by weight of refined sugar, 0.5 to 2.0% by weight of sodium alginate, 0.001 to 0.1% by weight of a grapefruit seed extract, 0.5 to 1.5% by weight of a natural pigment and 37.0 to 60.0% by weight of purified water. The dairy product contains alginic acid beads containing functional dietary fiber material and functional material in beads visible to the naked eyes to provide nutritional satisfaction and visual satisfaction. The product provides children and the old intaking thereof and young people favoring trendy beverages with balanced nutrients. Particularly, the present invention contributes to the prevention of childhood obesity, promotes consumption of the dairy products to enhance national health and profitability for livestock farms, and maximizes functionality and nutritional properties of the dairy products by fundamentally solving deficiency of the dietary fiber content.
