The invention provides a
kidney-tonifying hair-blackening
health food for women and a preparation method thereof. The method comprises the following steps: 1, coarsely crushing wild soybean, adding an
ethanol solution, carrying out extraction two to four times, each time lasting for 2 to 4 h, then carrying out
filtration, combining obtained filtrates and standing filter residues for subsequent usage; 2, adding the
ethanol solution into the filter residues obtained in step 1, adjusting the pH value of an obtained mixture to 1 to 3 with
hydrochloric acid or
phosphoric acid, carrying out extraction at a temperature of 55 to 95 DEG C two to four times, each time lasting for 20 to 40 min, then carrying out
filtration, combining obtained filtrates and standing filter residues for subsequent usage; 3, combining filtrates respectively obtained in step1 and step 2 and carrying out
evaporation to remove
ethanol so as to obtain
viscous liquid; 4, taking yerbadetajo
herb, glossy
privet fruit, mulberry, prepared
rehmannia root and the filter residues obtained in step 2, adding water until the above-mentioned materials are just immersed, immersing the materials for 4 to 6 h, decocting the materials in water one to three times, each time lasting for 20 to 30 min, then carrying out
filtration, subjecting obtained filtrates to cryoprecipitation at a temperature of 4 to 5 DEG C for 12 to 30 h and carrying out filtration again to obtain a filtrate; and 5, combining the
viscous liquid obtained in step 3 and the filtrate obtained in step 4, adding honey and a routine amount of
potassium sorbate and carrying out condensation until runny paste is obtained.