The invention relates to the field of 
skin care products, and specifically relates to a preparation method of antipersprant 
deodorant. The method is characterized in that an octylene hydrophobic groupis introduced into the particle surfaces of 
corn starch, so that hydroxyl on the 
starch molecules can be screened out to the maximum; the hydrophilia can be quickly reduced; the intermolecular actionforce of 
hydrogen bond, van der waals, etc. among the 
starch particles can be greatly reduced; and as a result, high flowability is realized at the 
macro level; the 
starch molecules with octylene arehydrophobic and can freely flow in a dry state, and the flowing form is extremely similar with the liquid form; the starch molecules in water float on the water and are hard to form suspension and are kept in a dry state; when the antipersprant 
deodorant is coated to oxter, the oxter can be locally kept dry, and sticky feeling is avoided in case of sweating, and the 
skin is soft, dry and clean; in addition, natural 
amino acid substrates are added and have the characteristics of naturally moisturizing, being resistant to oxidation, resistant to 
bacteria, resistant to static resisting, safe, and free from 
side effect, so that the functions of the antipersprant 
deodorant applied to a sensitive area in the oxter can be improved.