Abstract: An automatic sprouts culture bag having a plurality of longitudinal culture unit bags for storing sprout seeds, connected in series and may be hung on a lateral rod or wall for nursing sprouts in the air in conjunction with a water-dropping device arranged above said longitudinal culture unit bags for feeding water in drops from either a water bucket of a water faucet to said longitudinal culture unit bags, a plurality of siphons arranged in offset between two adjoining longitudinal culture unit bags for siphoning water from the upper longitudinal culture unit bag into the lower one for submerging the sprout seeds stored in an inner perforated bag received in said longitudinal culture unit bag, and an outer dark bag enclosing said longitudinal culture unit bags to prevent the sprouts from being exposed to the sunlight in order to form a dark environment for better growth of the sprouts.