The invention provides a heat-clearing lung-moistening beverage and a preparation method thereof. The beverage comprises fritillaria, platycodon grandiflorum, snow pear juice, apricot kernels, honeysuckle flowers, dried orange peel, trichosanthes kirilowii maxim, lily, licorice root and water. The beverage is prepared by organically combining some materials with the effect of clearing away heat and toxin. Unsaturated fatty acid, volatile oil, alkaloid and other physiologically active components contained in fritillaria, trichosanthes kirilowii maxim and apricot kernels can be separated through molecular distillation after alcohol extraction, water-soluble saponin, polysaccharide, amino acid and other physiologically active components contained in honeysuckle flowers and the like can be separated through water extraction, and accordingly the aims of clearing away heat and toxin and moistening lung with the beverage are achieved. The beverage can have the function of improving hyperactivity of fire due to yin deficiency of human bodies. Besides, people can conveniently drink the beverage due to a certain shelf life, and the beverage can make people adapt to existing fast-paced life. Besides, the beverage is sweet and can satisfy the taste of most people groups, and accordingly the beverage has certain market prospects.