  We present the broadband spectral analysis of all the six hard, intermediate
and soft state NuSTAR observations of the recently discovered transient black
hole X-ray binary MAXI J1348-630 during its first outburst in 2019. We first
model the data with a combination of a multi-colour disc and a relativistic
blurred reflection, and, whenever needed, a distant reflection. We find that
this simple model scheme is inadequate in explaining the spectra, resulting in
a very high iron abundance. We, therefore, explore the possibility of
reflection from a high-density disc. We use two different sets of models to
describe the high-density disc reflection: relxill-based reflection models, and
reflionx-based ones. The reflionx-based high-density disc reflection models
bring down the iron abundance to around the solar value, while the density is
found to be $10^{20.3-21.4} \rm cm^{-3}$. We also find evidence of a
high-velocity outflow in the form of $\sim$7.3 keV absorption lines. The
consistency between the best-fit parameters for different epochs and the
statistical significance of the corresponding model indicates the existence of
high-density disc reflection in MAXI J1348-630.
