The invention discloses health-preservation tea and preparation method thereof. The health-preservation tea is prepared from the following raw materials in parts by weight: 7-11 parts of sweet tea leaves, 10-14 parts of Dendrobium officinale, 5-7 parts of American ginseng, 5-8 parts of wolfberry, 4-6 parts of lotus leaves and 1-3 parts of liquorice. The preparation method comprises the processes of carrying out material selection, rinsing, drying, crushing, packaging and the like, and preparing bagged tea. The health-preservation tea has the function of enhancing the immunity and preventing cardiovascular diseases during the long-term drinking. The health-preservation tea is suitable for daily healthcare of a human body and capable of increasing the health degree of the bodies of the masses.