The invention belongs to the field of medical drugs and provides medicament for treating arrhythmia. The medicament is prepared from the following TCM raw materials in parts by weight: 10-20 parts of codonopsis pilosula, 15-25 parts of radix astragali, 10-15 parts of Indian buead, 10-15 parts of roasted rhizoma atractylodis macrocephalae , 5-15 parts of radix glycyrrhizae preparata, 5-10 parts of schisandra chinensis, 10-20 parts of Chinese angelica, 5-15 parts of ligusticum wallichii, 5-15 parts of radix paeoniae alba, 15-25 parts of savia miltiorrhiza, 5-15 parts of peach kernel, 5-15 parts of safflower, 5-15 parts of rhizoma acori graminei, 5-15 parts of coptis chinensis, 5-15 parts of caulis bambusae in taeniam, 5-15 parts of pericarpium citri reticulatae, 15-25 parts of radix sophorae flavescentis, 5-15 parts of ramulus cinnamomi, 10-20 parts of rhizoma corydalis, 5-15 parts of rhizoma nardostachyos, 15-25 parts of spina date seed, 25-35 parts of dragon's bone and 25-35 parts of raw oyster shell. After treatment by adopting the medicament provided by the invention, symptoms, including palpitation, chest distress and fatigue and the like, of a patient can be improved or obviously disappear, and compared with medicament in a control group, the medicament is effective in treatment and worthy of popularization.