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With the breakthrough in PeV gamma-ray astronomy brought by the LHAASOexperiment, the high-energy sky is getting richer than before. Lately, LHAASOCollaboration reported the observation of a gamma-ray diffuse emission withenergy up to the PeV level from both the inner and outer Galactic plane. Inthese spectra, there is one bump that is hard to explain by the conventionalcosmic-ray transport scenarios. Therefore, we introduce two extra componentscorresponding to unresolved sources with exponential-cutoff-power-law (ECPL)spectral shape, one with an index of 2.4, and 20 TeV cutoff energy, and anotherwith index of 2.3 and 2 PeV cutoff energy. With our constructed model, wesimulate the Galactic diffuse neutrino flux and find our results are in fullagreement with the latest IceCube Galactic plane search. We estimate theGalactic neutrino contributes of $\sim 9\%$ of astrophysical neutrinos at 20TeV. In the high-energy regime, as expected most of the neutrinos observed byIceCube should be from extragalactic environments.

Multi-messenger Study of Galactic Diffuse Emission with LHAASO and IceCube Observations