The invention provides an 
antioxidant of baking food and a preparation method thereof. The 
antioxidant includes 55-60 parts by weight of hydrogenized 
soya bean lecithin, 10-18 parts by weight of 
vitamin E, 5-10 parts by weight of soyabean 
protein polypeptide, 2-3 parts by weight of oligo-
xylose, 1-5 parts by weight of 
sucrose monostearate, 2-3 parts by weight of 
xanthan gum and 11-20 parts by weight of baked milk 
powder. The preparation method includes extracting 
lecithin from the 
soya bean lecithin, separating catalyst, discoloring oxydol, removing 
solvent after the reaction of 
catalytic hydrogenation, obtaining hydrogenized 
soya bean lecithin with 20-30 of 
iodine number, uniform mixing 55-60 parts by weight of hydrogenized soya bean lecithin, 10-18 parts by weight of 
vitamin E, 5-10 parts by weight of soyabean 
protein polypeptide, 2-3 parts by weight of oligo-
xylose, 1-5 parts by weight of 
sucrose monostearate, 2-3 parts by weight of 
xanthan gum and 11-20 parts by weight of baking milk 
powder to prepare the 
antioxidant for baking food. The invention has the advantages of strong antioxygenic property, pure 
natural property, no toxic and side effects, a plurality of healthcare functions.