Abstract: A method for obtaining a biopolymer hemostatic powder including adding in an reactor (1) a mixture of an organic acid (b), a combination of alcohols (b) (d) and a bioadhesive to obtain a binder solution and a step of incorporating on a base of the lower part of a fluid bed reactor (2) a polysaccharide (a) driven by an air stream injected at controlled temperature and speed; on which fluid and micro particles of the polysaccharide (a) are sprayed from the top of said fluid bed reactor (2) the binding solution and where the polysaccharide (a) is chitosan, the organic acid (b) is acetic acid, the alcohol combination (c) is alcohol and polyalcohol and the bioadhesive is polyvinyl alcohol.