A preparation method of powder-type healthful food using chicken breast is provided to enable consumers to eat chicken breast conveniently and easily by powdering the chicken breast and removing its peculiar smell. A preparation method of powder-type healthful food using chicken breast comprises the steps of: (a) removing fat from chicken breast; (b) soaking the chicken breast in 100vol% of milk, based on the volume of the chicken breast; (c) putting the chicken breast into an extruder, and squeezing a fixed volume of chicken breast out; (d) steaming the chicken breast with a solvent in a steamer for 30min to remove remaining fat; (e) drying the chicken breast in a dryer; (f) grinding the dried chicken breast into ultrafine particles; and (g) packing the ground chicken breast by a fixed amount. In the step (d), Citrus sudachi juice is added to the solvent at a level of 0.5~1vol%, based on the volume of the solvent. The step (e) comprises: drying the chicken breast in a hot-air dryer at 50~60°C for its water content to reach 10~15%; and then drying the hot-air dried chicken breast in a lyophilizer under a vacuum condition at -60~-50°C for 4~6hr to obtain dried chicken breast having a water content of 8~9%.
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