This invention relates to the field of honey detection and technology, specifically to a longanin compound, its preparation method, and a method for identifying longan honey. The longanin compound has the structure shown in Formula 1. Through research on longan honey, this invention discovered a new compound, longanin. This invention also found that when the honey to be tested simultaneously contains trans-, trans-
abscisic acid, longanin, and cis-, trans-
abscisic acid, the honey can be identified as longan honey. This invention also provides a new method for distinguishing the origin of longan honey.