The invention relates to the field of medicine formulas and in particular relates to a Chinese medicine decoction for treating Parkinson disease. The Chinese medicine decoction comprises the following Chinese herbal components in parts by weight: 17-22 parts of white paeony root, 13-17 parts of rehmannia glutinosa, 17-22 parts of Chinese angelica, 13-17 parts of liquorice, 17-22 parts of Chinese wolfberry fruit, 17-22 parts of astragalus mongholicus, 13-17 parts of tortoiseshell, 17-22 parts of fleece-flower root, 22-28 parts of uncaria rhynchophylla, 13-17 parts of gastrodiae elata, 3-7 parts of scorpio, 13-17 parts of red-rooted salvia root, 8-12 parts of baical skullcap root, 8-12 parts of dogwood and 1-2 parts of antelope horn powder. A preparation method of the Chinese medicine decoction comprises the following steps of: mixing the Chinese herbal components, namely the white paeony root, the rehmannia glutinosa, the Chinese angelica, the liquorice, the Chinese wolfberry fruit, the astragalus mongholicus, the tortoiseshell, the fleece-flower root, the uncaria rhynchophylla, the gastrodiae elata, the scorpio, the red-rooted salvia root, the baical skullcap root and the dogwood to obtain a mixture, mixing the mixture with water, decocting to obtain a decocted mixture, deslagging to obtain filtrate, grinding antelope horn into powder, and then uniformly mixing the antelope horn powder and the filtrate to obtain the Chinese medicine decoction. The Chinese medicine decoction is low in cost, has a high curative effect on treating the Parkinson disease, has no toxic and side effect and has the functions of tonifying, nourishing yin, calming liver, relieving dizziness, activating blood circulation and dispersing blood stasis so as to achieve a favorable effect on treatment of the Parkinson disease.