The invention relates to the technical field of traditional Chinese medicine, in particular to a biflavonoid compound extracted from Malachite flower and its preparation method and application. A kind of biflavonoid compound, molecular formula is C 33 h 24 o 16 , named as 8,8'-methylenebis(2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-6-methoxy-chromone, the chemical structure is as follows , the purposes of the described biflavonoids in the preparation of neuroprotective drugs. The preparation method adopts ethanol extraction, n-butanol extraction, silica gel column chromatography, polyamide, Sephadex LH‑20 successively, and can easily and quickly extract Isolate high-purity biflavonoid compounds, which have neuroprotective effects, and can be prepared in dosage forms such as tablets, granules, and capsules with commonly used pharmaceutical excipients, and are used to improve and treat neurological diseases such as depression. Therefore, biflavones The compounds can be used as a new class of natural products to develop traditional Chinese medicine, and have broad application prospects.