The invention relates to a preparation method of soybean milk. The preparation method at least comprises the following stages: (a), flour
preparation stage: providing a crushing container, a
heating element for heating the crushing container and a crushing device, directly heating the crushing container through the
heating element, so as to ensure that the temperature of the crushing container is increased to 70-90 DEG C, adding dried beans into the crushing container, crushing the dried beans into bean flour through the crushing device, and ensuring that
lipase and beany
flavor of the bean flour are removed in the crushing container at ambient temperature; (b), preparation and boiling stage: adding water to the bean flour, so as to prepare the bean flour into pulp, and heating and boiling the pulp till the pulp is well cooked. By adopting the
air temperature inside the crushing device, crushing,
lipase removal and beany
flavor removal are performed at the same time,
protein can keep invariant, beany
flavor can be effectively removed, and crushing the beans into bean flour firstly can greatly enhance the crushing
fineness, so that the soybean milk concentration can be effectively enhanced. In addition,
water vapor can be evaporated during crushing of the beans in the high-temperature environment, the bean flour is not easy to
agglomerate, and the crushing effect is good.