  There exists a significant deviation between the most recent Lattice QCD
simulation and experimental measurement by Belle for
$\Xi_{c}^{0}\to\Xi^{-}\ell^{+}\nu_{\ell}$. In this work, we investigate the
$\Xi_{c}\to\Xi$ form factors in QCD sum rules. To this end, the two-point
correlation functions of $\Xi_{c}$ and $\Xi$, and the three-point correlation
functions of $\Xi_{c}\to\Xi$ are calculated. At the QCD level, contributions
from up to dimension-6 four-quark operators are considered, and the leading
order results of the Wilson coefficients are obtained. For the form factors,
relatively stable Borel windows can be found. Our form factors are comparable
with those of Lattice QCD, except for $f_{\perp}$. The obtained form factors
are then used to predict the branching ratios of $\Xi_{c}\to\Xi
\ell^{+}\nu_{\ell}$, and our predictions are consistent with the most recent
data of ALICE and Belle, and those of Lattice QCD within error. Given that the
branching ratios only contain limited information, we suggest the
experimentalists directly measure the form factors of $\Xi_{c}\to\Xi$.
