The invention relates to an instant health food which is characterized in that adopted ingredients and percentage ratios thereof are as follows: 60-94 percent of two or three of sweet potatoes, yams and medicinal plants, 5-30 percent of one or two of gums and maltodextrins, 0.4-10 percent of a mixture that is formed by one or two or more than two of gelatin, agar, pectin and carrageenin and 0-30 percent of a mixture that is formed by one or two or more than two of starch syrup, barley maltsyrup, invert syrup, high fructose syrup and glucose syrup. The preparation method of the instant health food comprises the following steps: cleaning the medicinal plants, burdening, mixing, heating and curing, molding, drying, etc. The invention has simple preparation method, and the prepared instant health food has moderate chewiness, different tastes, various flavors and good palatability, is not sticky and is suitable for people of all ages, thus being a leisure and health food with rich nutrition.