The invention relates to the field of traditional Chinese medicines and in particular discloses a traditional Chinese medicine composition for improving sleep. The traditional Chinese medicine composition is prepared from the following raw materials in parts by weight: 15-25 parts of spina date seed, 15-25 parts of lucid ganoderma, 15-20 parts of acanthopanax and 5-15 parts of schisandra chinensis. According to the traditional Chinese medicine composition disclosed by the invention, the sleep time of a pentobarbital sodium hypnosis mouse can be prolonged; the sleep onset latency of the pentobarbital sodium hypnosis mouse is shortened; and the traditional Chinese medicine composition does not have an obvious direct sleeping effect and does not have bad effect on the weight of the mouse. The invention also provides a method for preparing the traditional Chinese medicine composition. The traditional Chinese medicine composition disclosed by the invention is a pure traditional Chinese medicine preparation, does not have a toxic or side effect and has good application prospects, and the sleep can be effectively improved.