The invention relates to a bean powder material package, a method and a device for manufacturing soyabean milk. A backwash area is formed on the bottom wall of the bean powder material package. The method for manufacturing the soyabean milk comprises the following steps: (a) pre-dissolving stage: an injection head is provided for injecting liquid to the material package through a membrane, and the liquid penetrates a bean powder layer to the backwash area with a flat surface or a concave surface on the bottom wall of the material package to form a liquid flow channel and (b) dissolving stage: the liquid is continuously injected to the material package by the injection head and is splashed reversedly through the backwash area to dissolve the bean powder upwards from the bottom of the material package layer by layer until the bean powder is completely dissolved, a leading-out hole is provided, and the soyabean milk in the material package is extruded to be discharged through the leading-out hole. With the adoption of the bean powder material package, the method and the device for manufacturing the soyabean milk, the liquid is injected to penetrate the bean powder layer to the backwash area on the bottom wall of the material package to form the liquid flow channel by the injection head, and the liquid is blocked and backwashed through the backwash area to form a fountain effect, so that the liquid is fully diffused to increase the dissolving area, and the agglomeration phenomenon of the bean powder is not easy to occur in a bean powder dissolving process, so that the prepared soyabean milk is uniform in concentration and better in mouth feel.
