Method for extracting tannin from banana stems and fruit axes

The invention discloses a method for extracting tannin from banana stems and fruit axes, and the method comprises the following steps: (1) collecting materials, and shredding the materials; (2) kneading into threads; (3) squeezing, and collecting a stock solution; (4) concentrating; (5) preparing an animal glue solution for later use: adding animal glue into a saturated sodium chloride solution, and heating to dissolve the animal glue; (6) preparing an ethanol solution which is composed of 45-50 parts of 95wt% ethanol, 45-50 parts of softened water and 0.5-1 part of 60wt% hydrochloric acid; (7) stirring and clarifying; (8) filtering; (9) extracting tannin; and (10) drying at a low temperature to obtain the finished tannin product. The method provided by the invention has the advantages of low development cost and low labor intensity, and is convenient and practical. By utilizing the method disclosed by the invention, wastes are changed into valuable substances, resources are fully utilized, and new raw materi