The invention relates to the field of beverage preparation, in particular to a beverage preparation technology. The beverage preparation technology comprises the following steps of (a) drying the olive leaves, crushing, screening, weighing, extracting by composite enzymatic hydrolysis, sucking and filtering, and fixing capacity; drying the lotus leaves, crushing, screening, weighing, extracting byhot water, sucking and filtering, and fixing capacity; drying the ginkgo leaves, crushing, screening, weighing, extracting by hot water, sucking and filtering, and fixing capacity; drying the liquorice root, slicing, screening, weighing, extracting by hot water, sucking and filtering, and fixing capacity; (b) mixing the extracting solution of olive leaf, extracting solution of lotus leaf, extracting solution of ginkgo leaf, and extracting solution of liquorice root in step (1) according to a volume ratio of 15:2:2:1, and adding the white granulated sugar according to a ratio of 2:100(g/ml) (white granulated sugar to mixed liquid). The beverage has the advantages that the value of the olive leaf is fully utilized; the effects of clearing heat, relieving sore throat, removing phlegm, producing body fluid, tonifying the spleen, detoxifying, and protecting the liver are realized.