Elaterin compound for restraining pest immune reaction and high-efficient preparation method and application of elaterin compound

The invention discloses an elaterin compound for restraining a pest immune reaction and a high-efficient preparation method and application of the elaterin compound. According to the preparation method, methanol is used for leaching momordica charantia, and three-stage high performance liquid chromatogram separation is performed to obtain three kinds of elaterin compounds of elaterin II, elaterinL and elaterin I. Multistage liquid chromatography at columnar overloading critical points is used for separating the compound, and three-stage high performance liquid chromatogram separation is used,so that the total time required for high performance liquid chromatogram separation is greatly shortened, the refining process is short in consumed time, the efficiency is high, and the elaterin compound which is high in purity can be efficiently and massively refined and prepared in an oriental manner. The obtained elaterin compound can effectively restrain immune reaction of various agriculturepests, so that the populat