The invention discloses a preparation method of a hexacaraban-
zinc complex, which comprises the following steps: adding a
zinc salt solution into a hexacaraban solution to obtain a
mixed solution; adjusting the pH value of the
mixed solution by using a NaOH solution; raising the temperature and continuously stirring; and after the reaction is finished, cooling the
mixed solution to
room temperature, filtering, adding absolute ethyl
alcohol into the filtrate, stirring and mixing, standing, separating the lower-layer precipitate, washing the precipitate, and
drying to obtain the hexacaraban-
zinc complex. The
aldose hexose-zinc complex is applied as an additive of
animal feed and used for supplementing zinc elements in animal bodies, and
aldose hexose serving as an animal
energy source can be efficiently absorbed by animals and is basically free of residues in animal excreta, so that the
aldose hexose-zinc complex is safe and environment-friendly. Therefore, the aldose-zinc complex obtained by complexing aldose with Zn < 2 + > can effectively improve the absorption and
uptake rate of animals to Zn < 2 + >, reduce the
excretion amount of zinc elements in the external environment of the animals, and avoid
pollution to the environment while adding trace zinc elements in animal bodies.