The invention provides a health food containing Maca reactive powder and a preparation method thereof. The health food comprises, by mass, 30 to 80% of Maca reactive powder, 10 to 50% of milkvetch root and 5 to 30% of American ginseng, with the balance being auxiliary materials. The preparation method comprises the following steps: respectively sieving Maca reactive powder, milkvetch root, American ginseng and the auxiliary materials with an 80-mesh sieve; respectively weighing the processed raw materials according to above-mentioned proportion; and putting the raw materials into a three dimensional mixer for uniform mixing so as to obtain the health food. The invention has the following beneficial effects: the health food may be a particle, a pulvis, a tablet or a capsule; Maca reactive powder prepared in the invention has rich nutrients, utmostly retains its active components, i.e., Macaenes, macamides, volatile oil and the like, and has a uniform and stable structure, a great surface area, good fluidity and a fast dissolving speed; the health food prepared in the invention is capable of improving human immunity, tonifying qi, benefiting the lung, resisting fatigue, enhancing sexual activity, etc.