Sennoside AB salt compound and its preparation method and application

The present invention relates to a kind of sennoside AB salt compounds and its preparation method and application.The technical scheme is that purifying to obtain high purity effective component sennoside AB salt compound at salt-precipitation by extraction-filtering-acidification-refined filtration-extraction-purification-compound, purity reaches between 80~90% using folium sennae as raw material；Sennoside AB salt compound of the invention is subject to proper auxiliary materials and dosage form needed for clinic is made, and clinically for preventing or treating constipation, significant effect, stability is good.Sennoside AB salt compound of the invention has many advantages, such as good defecating feces excretion, and to treat, constipation is good, rapid-action with safety, effect is strong, bioavilability is high, curative effect is stable, easy to use.The equipment of industrial product is succinct, easy to operate, at low cost, high degree of automation, easily controllable product quality.