  We investigate the 5.49 MeV solar axions flux produced in the $p(d,\,
^{3}{\rm He})a$ reaction and analyze the potential to detect it with the
forthcoming large underground neutrino oscillation experiment Jiangmen
Underground Neutrino Observatory (JUNO). The JUNO detector could reveal axions
through various processes such as Compton and inverse Primakoff conversion, as
well as through their decay into two photons or electron-positron pairs inside
the detector. We perform a detailed numerical analysis in order to forecast the
sensitivity on different combinations of the axion-electron ($ g_{ae} $),
axion-photon ($g_{a\gamma}$), and isovector axion-nucleon ($ g_{3aN} $)
couplings, using the expected JUNO data for different benchmark values of axion
mass in a model-independent way. We find that JUNO would improve by
approximately one order of magnitude current bounds by Borexino and it has the
best sensitivity among neutrino experiments.
