Graded extraction device suitable for amino acid

The invention discloses a graded extraction device suitable for amino acid and a use method thereof, and belongs to the technical field of amino acid extraction. The graded extraction device suitablefor amino acid comprises a concentration tank and a steam generator, a lower cover is fixedly connected to an opening in the top of the concentration tank, an upper cover is arranged above the lower cover, a filtering assembly is arranged between the upper cover and the lower cover, spraying heads which are evenly distributed are embedded in the bottom of the concentration tank, and a liquid storage tank is fixedly connected to the bottom of the concentration tank. A liquid conveying pipe arranged below the liquid level of the liquid storage tank is connected to the spraying head, a pressurizing mechanism is arranged on the liquid storage tank, a mounting cylinder is further fixedly connected to the center of the bottom of the concentration tank, and hollow transmission rods which are evenly distributed and penetr