The invention relates to ginkgo leaf tea and a preparation method thereof. The method comprises the following steps of: (1) cutting ginkgo leaves into ginkgo leaf threads, extracting ginkgo leaves with alcohol, preparing an alcohol filtrate, and concentrating; (2) grinding chrysanthemum, fiveleaf gynostemma herb and green tea into coarse powder, mixing coarse powder, and sterilizing; and (3) fully stirring and uniformly mixing a concentrated solution obtained in the step (1) and mixed powder, drying, sieving, and drying coarse particles and powder to obtain ginkgo leaf tea. In the tea components, fiveleaf gynostemma herb contains a plurality of gypenosides, and has the effects of lowering TC (Total Cholesterol) and TG (Triglyceride); ginkgo leaf contains flavone, and has the effect of lowering TC; fiveleaf gynostemma herb and ginkgo leaf co-act with each other, so that blood fat is lowered; chrysanthemum can be used for increasing high-density lipoprotein, lowering serum cholesterase and triglyceride acid, playing a certain role in adjusting blood fat, and adjusting flavor appropriately simultaneously; tea-catechin in green tea is used for lowering serum cholesterase level by increasing the excretion of lipoid substances; and the four types of raw materials act in a synergistic way, so that a very good effect of lowering blood fat is achieved.