The invention provides a plant health-care herb tea and a preparation method thereof. The herb tea comprises the following raw material components in parts by weight: 2-8 parts of honeysuckle flower, 2- 8 parts of chrysanthemum, 10-20 parts of pagada tree, 5-15 parts of mesona chinensis, 10-15 parts of balloon flower, 10-20 parts of fructus momordicae, 10-20 parts of kudzu root, 5-10 parts of rhizoma imperatae, 1- 4 parts of liquoric root, 5-10 parts of sealwort, 10-20 parts of Pu'er tea, 2-10 parts of mulberry, 1-3 parts of seville orange flower, 1-2 parts of orchid and 8,000-10,000 parts of water. The method comprises the following steps of: grinding each raw material component; and extracting, filtering, separating, purifying, adding auxiliary materials for blending, adjusting acidity, sterilizing and filling. The plant health-care herb tea prepared by using the method has the health-care effects of reducing fever, relieving fever, nourishing yin, moisturizing the lung, invigorating stomach and the like.