Swertiamarin thermal conversion product, as well as preparation method, preparation and application thereof

The invention discloses a swertiamarin thermal conversion product, as well as a preparation method and an application thereof. The swertiamarin thermal conversion product is prepared from swertiamarin as a raw material through heating conversion, elution, separation and purification; and the swertiamarin thermal conversion product contains false Chinese swertia herb lactone composition with the weight percent being over 60%. The method disclosed by the invention is simple and convenient to operate and low in cost; the problems that a false Chinese swertia herb lactone component is low in content in plants, and cannot be greatly obtained easily through chemical synthesis due to a complicated molecular structure are solved. Compared with swertiamarin, the swertiamarin thermal conversion product obtained by the method is relatively high in hepatoprotective activity and anti-HBV activity, and can be applied to prevention and treatment of related hepatitis diseases.