The invention discloses health herbal tea capable of improving immunity and a preparation method thereof. The herbal tea is prepared by the following steps: adding water, boiling processed bulk pharmaceutical chemicals, such as rehmannia glutinosa, dogwood, Chinese yam, Chinese-date, poria cocos, eucommia ulmoides, polygala tenuifolia, fried schisandra chinensis, fructus broussonetiae, fried foeniculum vulgare, morinda officinalis, herba cistanche, acori graminei rhizoma, wolfberry, and adding honey and white granulated sugar so as to prepare the health herbal tea. The health herbal tea provided by the invention can effectively strengthen the human immunity, reduce various immune diseases, such as the symptoms of influenza, weakness, improve the sub-health status obviously, can delay aging, remove dull yellow skin, and brighten skin to enable the skin to be smooth, white, fine and elastic.