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