A tirofiban hydrochloride injection and a preparation method therefor, the injection comprising tirofiban hydrochloride, sodium alginate, a pH adjuster and water. The preparation method is as follows : first preparing a citric acid-sodium citrate buffer solution by dissolving citric acid and sodium citrate in 10-50% water, and then dissolving tirofiban hydrochloride and sodium alginate in water, mixing the two solutions, adjusting pH, filtering, aliquoting, sterilizing, inspecting by using light, and packaging.