  The resolution of black hole singularities represents an essential problem in
the realm of quantum gravity. Due to the Belinskii, Khalatnikov and Lifshitz
(BKL) proposal, the structure of the black hole interior in vacuum Einstein's
equations can be described by the Kasner universe, which possesses the
$O\left(d,d\right)$ symmetry. It motivates us to use the anisotropic
Hohm-Zwiebach action, known as the string effective action with all orders
$\alpha^{\prime}$ corrections for the $O\left(d,d\right)$ symmetric background,
to study the singularity problem of black hole. In this letter, we obtain the
singular condition for black holes and demonstrate that it is possible to
resolve the Schwarzschild black hole singularity through the non-perturbative
$\alpha^{\prime}$ corrections of string theory.
