Preparation method for anhydrous tetracycline amorphous material

The invention relates to a preparation method for an anhydrous tetracycline amorphous material. The anhydrous tetracycline amorphous material according to the invention has the advantages that the solubility of anhydrous tetracycline is increased, and the bioavailability of a pharmaceutical preparation is further benefited. Compared with the present crystal form anhydrous tetracycline, the anhydrous tetracycline has the advantages that the solubility is obviously increased, the absorption of the body for the drug is further benefited and the drug can more effectively exert the clinical disease treatment function. The preparation method for the anhydrous tetracycline amorphous material, disclosed by the invention, is simple in operation and can be easily realized.