  In this work, we propose a powerful probe of neutrino effects on the
large-scale structure (LSS) of the Universe, i.e., Minkowski functionals (MFs).
The morphology of LSS can be fully described by four MFs. This tool, with
strong statistical power, is robust to various systematics and can
comprehensively probe all orders of N-point statistics. By using a pair of
high-resolution N-body simulations, for the first time, we comprehensively
studied the subtle neutrino effects on the morphology of LSS. For an ideal LSS
survey of volume $\sim1.73$ Gpc$^3$/$h^3$, neutrino signals are mainly detected
from void regions with a significant level up to $\thicksim 10\sigma$ and
$\thicksim 300\sigma$ for CDM and total matter density fields, respectively.
This demonstrates its enormous potential for much improving the neutrino mass
constraint in the data analysis of up-coming ambitious LSS surveys.
