The invention discloses traditional Chinese medicine granules for treating postpartum night sweat and a preparation method, belonging to the field of traditional Chinese medicines. The active ingredient of the medicine consists of the following raw materials: beechey fig root, radix astragali, glutinous rice root, Argentina anserina, henry woodbetony root, rhizome of perny false fairybells, arrhenatherum elatius, liquorice, bidens tripartita, wild groundnut seed, mulberry fruit, salvia miltiorrhiza, glossy privet fruit, caulis spatholobi, alectoria asiatica du rietz, donkey-hide gelatin, rhus chinensis mill, herba aristolochiae, pseudostellaria heterophylla, turtle shell, longspurred fairybells rhizome, rhizoma picrorhizae, platycladi seed and lucid ganoderma. In the invention, the adopted medicinal materials conform to the principle of monarch, minister, assistant and guide; the traditional Chinese medicine granules act appropriately to the situation according to the pathogeny and have the functions of tonifying and replenishing liver and kidney, nourishing yin and moistening lung, invigorating spleen and harmonizing stomach, tonifying and replenishing qi and blood, nourishing yin and clearing heat, nourishing and activating blood, consolidating exterior and stopping sweating and nourishing heart and tranquilizing mind, realize good absorption effect and remarkable curative effect and avoid toxic or side effects or clinical adverse reactions; and according to clinical verification, the cure rate on postpartum night sweat is relatively high.