The invention discloses a drug for treating symptoms of a later stage of chronic manganese poisoning. The drug is prepared from following raw herbal materials: herbs of indian abutilon, tall gastrodia tuber, Acorus gramineus Soland, altai anemone roots, chrysanthemum, oxygraphis glacialism, Chinese honey locust, bayberry roots, aquilariaceae malaccensis, bulbiferous stonescrop, tung tree roots, canscora, stem and leaves of cryptotaenia japonica hassk, puncturevine caltrop fruits, Saffron, Cyperus cyperoides, jasmine flowers, scabrousstem greenbrier rhizomes melitodes squamata nutting, asplenium incisum Thunb, murraya jasminorage, roots or stem of evergreen mucuna, aconiteleaf syneilesis herbs, fiddle-leaf fig roots and Japanese saussurea. The drug has the benefits as follows: the drug can be applied to treatment of the later stage of chronic manganese poisoning, Parkinson's syndrome, four-limb hypermyotonia, static tremor, lalopathy, gait difficulty and the like as well as mental symptoms including involuntary crying and laughing, obsessive thoughts, impulsive behaviors and the like can be relieved very well through drug therapy, the symptoms are eliminated through body regulation, so that the symptoms after poisoning are relieved very well, and the condition of a patient is greatly improved.