The invention discloses a mask slurry preparing method. The mask slurry preparing method comprises the steps that ramie roots, radix astragali and rhizoma typhonii are decocted in clear water to obtain first mixed liquid; aloe, seaweed, cherries, rose, chrysanthemum flowers, geranium, coix seeds, millet, rice, wheat germs and Chinese wolfberry fruits are dried; grinding is performed; water bath ultrasonic extraction is performed to obtain first solid powder and second solid powder; big pig bone enzymolysis is performed, and big pig bones and pig skin are steamed to obtain second mixed liquid; the mixed liquid, the second mixed liquid, the first solid powder, the second solid powder, egg white, pearl powder, honey, tea polyphenol, soy isoflavones, water, phenoxyethanol, chlorphenesin and propylene glycol are mixed to obtain mask slurry. The mask slurry preparing method is simple in process, can retain the nutrition ingredients of the raw materials to the most degree, and the prepared mask slurry is free of additives and has the good effects of moisturizing the skin, retaining moisture, inhibiting acnes, resisting wrinkles and keeping the skin tight and elastic.