The complex sterilization method of powdered food according to an embodiment of the present invention includes (a) pulverizing and pulverizing agricultural products, (b) removing metallic foreign substances contained in agricultural product powder, (c) removing foreign substances. Comprising the step of compound sterilization of the agricultural product powder, (d) moist heat sterilization of the complex sterilized agricultural product powder, and (e) the step of far-infrared drying the moist heat sterilized agricultural product powder.
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