The invention discloses a traditional Chinese medicine composition for assisting to improve sleep, a preparation method and application of the traditional Chinese medicine composition. The traditional Chinese medicine composition for assisting to improve sleep is prepared from, by weight, 15-65 parts of semen juglandis, 15-65 parts of spina date seed, 5-55 parts of salvia miltiorrhiza, 5-35 parts of acanthopanax, 5-35 parts of tuber fleeceflower stem, 5-15 parts of Astragalus membranaceus, 5-15 parts of lotus seed, 5-35 parts of jujube, 5-35 parts of wolfberry, 5-15 parts of sesame, 5-15 parts of grape skin, 5-15 parts of dark plum, and 5-15 parts of hawthorn. The animal experiment proves that the high and medium dosages of test materials can assist to prolong the sleep time of mice pentobarbital sodium and significantly shorten the sleep latent time of the mice pentobarbital sodium; however, every dosage is not directly acted on promoting animal sleep; therefore, the traditional Chinese medicine composition is promoted to be a health care product for improving human sleep; thus the life quality of the human body is obviously improved. The traditional Chinese medicine composition is applied to both of cold and warm figures, capable of eliminating and supplementing at the same time, compensating without obstructing the evil, giving consideration to Yin and Yang of liver, spleen and kidney, so that the dampness of spleen can be removed; moreover, the composition has the effects of sedative and hypnotic, promoting blood circulation to remove meridian obstruction, nourishing liver and kidney, and replenishing qi to invigorate the spleen.