The present invention describes a reduction type coenzyme Q10 powder, a composition thereof, and a preparation method thereof. The reduction type coenzyme Q10 powder is obtained by reacting an oxidation type coenzyme Q10 with the presence of a reducing agent, removing an organic solvent and other purities after the reaction is finished to obtain an oil-soluble reduction type coenzyme Q10 liquid, and then directly performing prill formation with cold wind on an obtained reduction type coenzyme Q10 greasy substance. The reduction type coenzyme Q10 powder has a lower crystallinity, and in a Cu-Kα X-ray diffraction spectrum, has a strong peak at a diffraction angle 2θ being 18.9 DEG , and has a very strong absorption peak at a diffraction angle 2θ being 22.8 DEG. The reduction type coenzyme Q10 powder is in an incompletely crystallized state, has desirable stability and desirable oral bioavailability.