  The hot massive luminous blue variables (LBVs) represent an important
evolutionary phase of massive stars. Here, we report the discovery of a new LBV
-- LAMOST J0037+4016 in the distant outskirt of the Andromeda galaxy. It is
located in the south-western corner (a possible faint spiral arm) of M31 with
an unexpectedly large projection distance of $\sim$ 22 kpc from the center. The
optical light curve shows a 1.2 mag variation in $V$ band and its outburst and
quiescence phases both last over several years. The observed spectra indicate
an A-type supergiant at epoch close to the outburst phase and a hot B-type
supergiant with weak [Fe II] emission lines at epoch of much dimmer brightness.
The near-infrared color-color diagram further shows it follows the distribution
of Galactic and M31 LBVs rather than B[e] supergiants. All the existing data
strongly show that LAMOST J0037+4016 is an LBV. By spectral energy distribution
fitting, we find it has a luminosity ($4.42 \pm 1.64$)$\times 10^5$ $L_{\odot}$
and an initial mass $\sim 30$ $M_{\odot}$, indicating its nature of less
luminosity class of LBV.
