The present invention provides a medical herb composition for promoting hair growth, which comprises: a first herb material, which comprises of 2-40 part by weight ofGinseng Radixand 0.6-28 part by weight ofAngelicae Radix a second herb material which comprises of 0.6-28 part by weight ofAngelicae Radix, 2-40 part by weight ofAstragali Radixand 20-96 part by weight of a mixture containing ofDendrobium hancockii,Eclipta prostrateandRehmanniae Radix and a pharmaceutical acceptable carrier comprising an excipient. The present invention further provides a method for preparing the medical herb composition with improved efficiency forpromoting hair growth and reducing effective dose of the present composition.本發明係有關於一種促進毛髮生長之中草藥組成物,包括:一第一藥材,其係包括2-40重量份之人參及0.6-28重量份之當歸;一第二藥材,其係包括0.6-28重量份之當歸、2-40重量份之黃耆以及20-96重量份之女貞子、旱蓮草及地黃之混合物;以及一醫藥可接受之載體,其包括賦形劑。此外,本發明更提供一種促進毛髮生長之中草藥組成物之製備方法,以有效降低服用劑量以及提高該中草藥組成物之功效。