The invention discloses natural high-emulsibility grease body powder and a preparation method thereof. A preparation method of a grease body comprises the following steps: (1) crushing a raw material, namely maize germs; (2) mixing the crushed maize germs with water, and carrying out first time of extraction under an alkaline condition; (3) grinding an extracted mixed material into thick liquid; (4) carrying out second time of extraction on the ground mixed material; (5) filtering a mixed material subjected to the second time of extraction, and collecting filtrate; (6) centrifuging the filtrate, and collecting an upper-layer material to obtain the grease body. According to the method provided by the invention, the yield of the grease body is improved; the method has the advantages of no toxin, simpleness and convenience, relatively low cost and suitability for industrialization; grease body emulsion has good emulsifying stability and anti-oxidization property through adding additional proteins and homogenizing; the powder has good storage performance at room temperature, and can be used as a more healthy substitute of non-dairy cream.