Preparation method of Sishen pill extract and medical application of Sishen pill extract in memory improvement

The invention discloses a preparation method of a Sishen pill extract and medical application of the Sishen pill extract in memory improvement, and the preparation method comprises the following steps: S1, weighing traditional Chinese medicine raw materials in parts by weight: nutmeg, fructus psoraleae, schisandra chinensis, fructus evodiae, jujube and ginger; s2, the traditional Chinese medicine raw materials obtained in the step S1 are supplemented with 50%-75% ethyl alcohol with the amount 5-20 times that of the traditional Chinese medicine raw materials, heating is conducted till the ethyl alcohol is boiled, reflux extraction and filtering are conducted, then a first extracting solution and medicine residues are obtained, and the first extracting solution is concentrated into thick paste for use; s3, adding 1-20 times of distilled water into the medicine residues in the step S2, cooking for 1-3 times, filtering to obtain a second extracting solution, and concentrating to obtain thick paste; and S4, mergin