The invention belongs to the technical field of food processing technology, and discloses bean dreg modification technology and a method for preparing a leisure food using the modified bean dreg. The modification technology comprises: modifying fresh bean dreg through high-temperature steaming combined with roll pressing; uniformly mixing the modified bean dreg with a binding agent solution and performing swelling; adding other auxiliary materials and performing uniform mixing; and carrying out first drying, peeling, cutting, second drying and packaging to obtain a modified leisure food. According to the invention, the bean dreg is modified through special technology and equipment, so that two key bottleneck problems of a beany flavor and roughness in the food development and use of the bean dreg are solved, and the bean dreg is suitable for direct consumption. The modified bean dreg is taken as a main raw material of the leisure food; the flavor and nutrition of the bean dreg are maintained; and the modified bean dreg can be combined with sea sedge and dry fruits to product a product, which is fragrant and crisp and has various flavors and abundant nutrition, so that the leisure food is a novel fashionable healthy food. The bean dreg modification technology and the method for preparing the leisure food using the modified bean dreg are simple in technology and low in cost, is green and with no pollution, and is easy for industrial production and popularization.