The invention discloses a lemon tea capable of clearing away heart-fire and moistening dryness and a preparation method of the lemon tea. The lemon tea is prepared from the following raw materials in parts by weight: 20-25 parts of lemon slices, 16-18 parts of lophatherum gracile, 5-7 parts of prepared liquorice roots, 8-10 parts of tremella, 3-5 parts of semen cuscutae, 2-4 parts of cassia seeds, 5-7 parts of elsholtzia ciliate, 1-2 parts of clematis hexapetala pall, 8-10 parts of white chrysanthemum, 3-5 parts of shepherd's purse flowers, 2-4 parts of Hami melon seeds, 1-2 parts of hemp palm leaves, 1-2 parts of roselle, 3-4 parts of golden camellia, 0.5-1 part of roots of smalleaf desmodium, 0.5-1 part of adiantum caudatum, 2-4 parts of a condiment and 20-22 parts of crystallized sugar. According to the lemon tea, the lemons have the effects of stabilizing motion and eliminating fatigues, and are matched with a plurality of types of other traditional Chinese medicines, so that the lemon tea has the effects of clearing and activating the channels and collaterals, softening blood vessels, blending liver and spleen, nourishing yin and enriching blood, moistening lung to arrest cough, cleaning heat and detoxifying and the like; and the lemon tea is prepared from pure natural raw materials, has no side effect and is suitable for people to drink for maintaining health.