The invention relates to a preparation method of a dasheen clear juice beverage. The total solid content of the dasheen clear juice beverage is over 5 percent, the total fat content is less than 2 percent, and the sodium content is less than 0.1g/100mL. The preparation method comprises the specific steps of (1) pretreating dasheens, water, composite enzymes, condiments, a stabilizing agent and a preservative, which serve as raw materials, to obtain clean dasheens; (2) performing grinding and gelatinization to obtain mashed dasheen; (3) preparing dasheen normal juice by an enzyme method to obtain the dasheen normal juice; (4) clarifying the rough dasheen normal juice to obtain clarified dasheen normal juice; (5) performing mixing, homogenizing and sterilizing to obtain the dasheen clear juice beverage. According to the preparation method disclosed by the invention, the dasheen clear juice beverage is prepared by a two-enzyme method, so that the enzymatic hydrolysis of the dasheens is increased; silicone soil is adopted for fine filtering, so that the problem that a dasheen clear juice beverage is turbid after a certain period of time is solved. The dasheen clear juice beverage prepared by the preparation method disclosed by the invention smells harmoniously good, tastes smooth, is uniform and stable and has a long storage period.