The invention discloses wild vegetable crisp chips and a preparation method thereof. The wild vegetable crisp chips are prepared from wild vegetable powder, L-arabinose, sweet corn powder, lupeose, nicotinamide and tea green pigment by the steps of mixing, forming and drying, wherein the raw materials consist of the following components in percentage by weight: 10 to 80 percent of wild vegetable powder, 5 to 15 percent of L-arabinose, 10 to 70 percent of sweet corn powder, 2 to 6 percent of lupeose, 0.5 to 5 percent of citric acid, 0.001 to 0.002 percent of nicotinamide and 0.02 to 0.04 percent of tea green pigment. The wild vegetable crisp chips prepared by the method maintain the beneficial nutritional ingredients and the health-care effect of wild vegetables to the maximum degree, and have strong natural flavor and unique taste of the wild vegetables. The products are sour, sweet, crisp and delicious, are abundant in nutrients, and improve people's food preference. The preparation process of the products is simple, the industrialized production is facilitated, and a novel variety is added for developing wild vegetable food.