The invention discloses sea buckthorn composite tea capable of moistening, facilitating feces excretion, clearing livers and improving visions and a preparation process thereof, and belongs to the technical field of health care tea products. The sea buckthorn composite tea comprises herbal medicinal compound extract of sea buckthorn and tea leaves at a mass proportion of 1:2-5, and the herbal medicinal compound extract of sea buckthorn is prepared from, by weight, sea buckthorn leaves, semen cassiae seeds, fructus cannabis seeds, tuberose, hovenia acerba leaves, sunset abelmoschus roots, roots of Chinese bananas, boschniakia rossica, mountain scrophulariae, sophora japonica, korean pine seeds, Chinese mugwort sheets, leucas mollissima, boxthorn leaves, pleioblastus amarus, lonicera japonica, feverfew, jasmine flowers, radix rehmanniae, platycladi seeds and dendrobium. The preparation process comprises the following steps of smashing the above raw materials, conducting water extraction and alcohol extraction on the smashed raw materials, mixing water extract and alcohol extract, performing concentration treatment on the mixture of the water extract and the alcohol extract, and obtaining the herbal medicinal compound extract of sea buckthorn; immersing the tea leaves into the herbal medicinal compound extract of sea buckthorn, and drying the obtained material. The sea buckthorn composite tea has the advantages of being capable of clearing heat, removing toxicity, clearing livers, improving visions, moistening intestines and facilitating feces excretion, almost the same as common tea in shape, and convenient to drink.