  New vectorlike quarks have been proposed in many scenarios of new physics
beyond the Standard Model, which address the hierarchy problem and may be
potentially discovered at the Large Hadron Collider~(LHC). Based on a
model-independent framework, we propose to search for the vectorlike
$B$-quark~(VLQ-$B$) and focus on resonant production via $b$-gluon fusion
through chromomagnetic interactions. We then explore the possible signals of
the VLQ-$B$ through the $B\to tW$ decay mode at the 14 TeV LHC. After a rapid
simulation of signal and background events, the $2\sigma$ excluded regions and
the $5\sigma$ discovery reach in the parameter plane of $\kappa_{B}-M_B$ are
obtained at the LHC with an integrated luminosity of 300~(3000) fb$^{-1}$ in
the dilepton final states.
