The invention provides a traditional Chinese medicine composition for treating chronic arrhythmia of elderly people, and a preparation method of the traditional Chinese medicine. The traditional Chinese medicine comprises raw materials as follows: astragalus, salvia miltiorrhiza radix, heterophylly falsestarwort roots, vine of multiflower knotweed, stigma croci, anisetree barks, honeysuckle stems, peach juvenile branchlets, pachyrhizua angulatus, asparagus cochinchinensis, lotus plumule, cortex acanthopanacis, common cnidium fruit, cartialgenous, polygala tenuifolia, radix aconiti carmichaeli, pepperweed seeds, Chinese dates, alpine yarrow herbs, adenophora tetraphylla, cynanchum glaucescens, callicarpa macrophylla, concretio silicea bambusae and ligusticum wallichii. The traditional Chinese composition has the efficacy of definite curative effect, small toxic and side effect, safety, reliability, and two-way regulation effect on the body function.