The invention discloses a composition with a blood pressure reducing function and a preparation method of same. The composition with the blood pressure reducing function comprises the following raw materials: radix bupleuri, radix scutellariae, radix geutianae, spica prunellae, peppermint, uncaria rhynchophylla, dragon bone, oyster, coptis root, gypsum, pinellia tuberifera tenore, raw pearl barley, ruddle, immature bitter orange, cortex magnoliae officinalis, kudzu root, gastrodia elata, ligusticum wallichii, Chinese ephedra, astragalus mongholicus, achyranthes root, raw hawthorn, leonurus and corn silk. The composition with the blood pressure reducing function, which is prepared by the preparation method, not only can improve brain blood supply, but also can promote gastrointestinal digestion and absorption, expand capillary vessels of the brain, cervical artery and four limbs so as to achieve the purposes of reducing blood pressure, has a remarkable therapeutic effect, can reach 98.3% of effective rate and 37.9% of clinical recovery rate, and can restore the elasticity of blood vessels of patients with light symptoms and short illness time so as to achieve the effect of clinical recovery, and is suitable for people of different ages.