  In this paper we investigate impacts of non-standard neutrino interactions
(NSIs) to the limitations on the discovery potential of dark matter in direct
detection experiments. New neutrino floors are derived taking into account
current upper bounds on the effective couplings of various NSIs. Our study
shows that the neutrino floors of the standard model neutral current
interactions can be significantly changed in the presence of vector-current NSI
and scalar-current NSI, and the neutrino floors can be raised up to about
${\cal O}(20\%)$ in the presence of pseudo-scalar-current NSI, and there are
almost no impacts to the neutrino floors from the axial-vector NSI and the
tensor NSI. We suggest combining the dark matter direct detection experiments
with the coherent elastic neutrino nucleus scattering experiments to hunt for
new physics behind the signal of nuclear recoil in the future.
