The invention relates to a medicament for treating arrhythmia, in particular to a Chinese medicine composition which is prepared by using plant Chinese herbal medicines as raw materials and is used for treating arrhythmia. The Chinese medicine composition is characterized by comprising the following raw medicines for preparing effective components of the composite by weight: 10-18g of codonopsis pilosula, 5-15g of astragalus mongholicus, 5-15g of angelica sinensis, 5-15g of rehmanniae praeparat, 5-15g of salvia miltiorrhiza bunge, 4-12g of safflower, 4-12g of Chinese yam, 4-12g of poria cocos, 3-8g of platycladi seed, 3-8g of spina date seed, 3-8g of Chinese magnoliavine fruit and 3-8g of radix glycyrrhizae preparata. The matching of the medicines of the invention brings out the best in each other; the Chinese medicine composition has the effects of tonifying spleen and qi, harmonizing the stomach, nourishing the blood, tonifying lung, consolidating superficies, nourishing heart, calming the nerves, supplementing and activating blood, nourishing kidney, promoting the production of body fluid, tonifying qi, restoring pulse, and the like; through the synergy of the medicament effects, the Chinese medicine composition provided by the invention can treat both principal and secondary aspects of diseases and has no side effect; and the invention has obvious curative effect mainly on arrhythmia caused by yin and yang asthenic disease of qi blood of internal organs, internal injury due to emotional disorder, heart malnutrition due to interaction of qi stagnation and blood stasis and heart vessel unsmoothness.