The utility model relates to a reinforced technical field of ration, concretely relates to solid automatic feed device and alkali lye is system of dissolving in advance. The utility model provides a solid automatic feed device includes that consecutive solid adds unit, measurement unit, solid conveying unit and the control unit, can replace manual feeding, has alleviateed intensity of labour, hasimproved production efficiency, has reduced manufacturing cost, has avoided the great problem of hand feed process error simultaneously, measure reliable and stable, the accuracy height. The utility model provides an alkali lye is the system of dissolving in advance, has realized that alkali lye dissolves systematic automatic continuous operation in advance, and alkali solution concentration is stable and adjustable, has improved system stability, has alleviateed intensity of labour simultaneously, has improved production efficiency, and then has improved the productivity effect of enterprise.