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We discuss the discovery potential of JUNO experiment for neutrino lines fromMeV dark matter (DM) annihilation and decay in a model independent way. We findthat JUNO will be able to give severe constraints on the cross section of DMannihilating into neutrinos and on the lifetime of DM decaying into neutrinos.More concretely, with $20$ years of data-taking in the fiducial volume $17$kton, the cross section will be constrained smaller than $4\times10^{-26}\,{\rm cm^{3}\,sec^{-1}}$ for the mass of a DM particle $15\,{\rm MeV}\lesssim m_{\chi} \lesssim 50\,{\rm MeV}$ at $90\,\%$ C.L., which might bestrong enough to test thermal production mechanism of DM particles for suchrange of DM mass. The lifetime will be constrained as strong as $1\times10^{24}\,{\rm sec}$ for the mass of a DM particle $m_{\chi} \simeq 100\,{\rmMeV}$ at $90\,\%$ C.L..

Neutrino lines from MeV dark matter annihilation and decay in JUNO