The invention discloses frozen sweet corn drink and a preparation method thereof. The frozen sweet corn drink is prepared from the following materials of frozen sweet corn kernels, cellulase, amylase, glucoamylase, protease, corn oil and water. The preparation method comprises the following steps of corn kernel freezing, grinding, cellulose enzymolysis, amylase enzymolysis glucoamylase enzymolysis and protease enzymolysis, filtering, allocating, homogenizing, sterilizing and filling. According to the frozen sweet corn drink and the preparation method thereof, the bioengineering high and new technology is adopted, part improvement is conducted in the cellulase engineering technique, the process that millet is changed into liquid from solid can be completed in a few hours, the liquidation speed is shortened, energy consumption is reduced, and production cost is reduced; obtained products kept nutrients of corn, and small molecular nutrient substance is more suitable for human bodies to absorb; and the flavor of sweet corn is remarkable, the appearance is attractive, nutrient elements of the sweet corn are utilized maximally, meanwhile, unsaturated fatty acid of the corn is supplemented, seed coats of the corn are decomposed, and the raw material utilization ratio is increased.