  Modulation of magnetization in magnetic Weyl semimetals leads to the shift of
Weyl points in momentum space, which effectively serves as the
chirality-dependent gauge field for the Weyl fermions. Here, we theoretically
study such a magnetization-induced chiral gauge field, in a fully
spin-polarized Weyl ferromagnet $\rm{Co}_3\rm{Sn}_2\rm{S}_2$. From a
tight-binding model of $\rm{Co}_3\rm{Sn}_2\rm{S}_2$ on stacked kagome lattice
with magnetism, we calculate the magnetization-dependent evolution of the Weyl
points in momentum space, resulting in the chiral gauge field. In the presence
of the magnetic domain wall structure, we evaluate the chiral magnetic field
arising from the spatial profile of the chiral gauge field. We find that a
magnetic domain wall in $\rm{Co}_3\rm{Sn}_2\rm{S}_2$ gives rise to a giant
chiral magnetic field for the Weyl fermions, which reaches the order of a few
hundred tesla to induce the Landau quantization. Such a giant chiral magnetic
field may also influence the novel transport phenomena, such as the charge
pumping by the domain wall motion, compatible with the spin-motive force.
