This case report presents a 34-year-old female patient. Her chief complaints are akinetic mutism and cognitive dysfunctions. We have diagnosed her with leukoencephalopathy. She was treated with Korean traditional herbal medicines (Joojackwhan) for 33 days continuously. The effects of treatment were measured by the Korean Mini - Mental State Examination and Modified Bathel Index. After treatment, her chief complaints have been improved. Furthermore, the K-MMSE, MBI scores increased. From this case, we deduced that the Korean traditional herbal medicines (Joojackwhan) could be effective for cognitive dysfunctions and akinetic mutism caused by leukoencephalopathy.