The present application belongs to the field of functional fermented drinks, and provides a hangover-alleviating and liver-protecting composite fermented drink containing white lentil extract and a preparation method thereof. The present application forms a grafted core through "covalent
grafting of white lentil amino components and D-
anhydrous glucose Maillard", constructs a core-shell
nanocomposite with tea polyphenols, and realizes high-stable nanodispersion of D50 80-200 nm and PDI≤0.25, high-load interface combination of tea polyphenols 10%-50%, and low-melting easy
processing of 20-300 mPa·s and long-term anti-
settling and anti-
flocculation at pH 3.2-4.6, thereby solving the contradictions of low-melting and high-
solid-content stability in an acidic
plant-based
fermentation system, high-
polyphenol loading causing
turbidity and astringency, and activity deterioration caused by heat treatment.