The invention discloses a preparation method of fruit/vegetable compound sweetend roll. The method comprises the steps of preparing carrot pulp, preparing apple pulp, preparing fruit/vegetable pulp, preparing a konjac glucomannan mixed gel liquid, preparing mixed pulp, scraping slices and baking. The preparation method disclosed by the invention sufficiently combines the gel property of konjac glucomannan and the healthcare function of fruit/vegetable by use of the principle that the konjac glucomannan generates a synergistic effect with carrageenan and the like in an acid condition to form a thermal-reversible gel, overcomes the shortcomings of poor mechanical performance of the traditional compound fruit/vegetable sweetend roll and irregular product forming through physical blending of konjac glucomannan and carrageenan, improves the thermal characteristics and mechanical performance of products, and enhances the product toughness. The prepared fruit/vegetable sweetend roll has an outstanding healthcare function, attractive color, rich nutrition, sweet and good taste and relatively good mechanical performance and toughness, and is convenient to carry.