Application of triterpenoid saponin compound to preparation of anti-pathogeny microorganism medicament

The invention provides application of a triterpenoid saponin compound to the preparation of an anti-pathogeny microorganism medicament, particularly provides to application of the triterpenoid saponin compound to the preparation of anti-tuberculosis and anti-leprosy medicaments. The triterpenoid saponin compound is a triterpenoid saponin compound shown as a chemical formula in the specifications.In the chemical formula, any two of R1, R2 and R3 refer to methyl and the other refers to a hydrogen atom; R4 refers to pentatomic or hexahydric monosaccharide or disaccharide formed by the pentatomic or hexahydric monosaccharide or glycosyl formed by an aldehyde acid derivative of the monosaccharide or the disaccharide; and R5 refers to a hydrogen atom or pentatomic or hexahydric monosaccharide or disaccharide formed by the pentatomic or hexahydric monosaccharide or a substituent group formed by an aldehyde acid derivative of the monosaccharide or the disaccharide. According to the invention, a medicament with a remarkable anti-pathogeny microorganism effect is provided.