The preparation method comprises the following steps: selecting high-quality dried
ginseng and walnut kernels, shelling the walnut kernels, cleaning the walnut kernels, carrying out low-temperature
freeze drying on the walnut kernels, and carrying out
freeze drying treatment on the dried
ginseng to retain effective components of the dried
ginseng so as to ensure that active substances such as
ginsenoside and
amino acid are retained to the maximum extent; the freeze-
drying temperature is controlled to be-40 DEG C to-50 DEG C, the
drying time is 12-24 hours, the freeze-dried walnut kernels and ginseng are smashed through low-temperature superfine smashing equipment respectively, screening is conducted after smashing, and ginseng
powder and walnut
powder with the particle size being 80-200 meshes are obtained. According to the ginseng and walnut
powder and the preparation method thereof, through innovative processes such as low-temperature
freeze drying,
superfine grinding, supercritical CO2 extraction and an embedding technology, active ingredients in ginseng and walnuts can be effectively reserved, the taste is improved, the
solubility of the product is enhanced, the
shelf life is prolonged, the
bioavailability of nutritional ingredients is improved, and the ginseng and walnut powder is suitable for industrial production. And a health-care food which is healthier and good in mouth feel is provided for consumers.