  We present novel constraints on boosted light dark matter particles (denoted
as ``$\chi$'') from evaporating primordial black holes (PBHs) using 205.4
kg$\cdot$day data from the China Jinping Underground Laboratory's CDEX-10
p-type point contact germanium detector with a 160 eVee analysis threshold.
$\chi$ from PBHs with masses ranging from 1$\times$10$^{15}$ g to
7$\times$10$^{16}$ g are searched in this work. In the presence of PBH
abundance compatible with present bounds, our result excludes the
$\chi$-nucleon elastic-scattering cross section region from
3.4$\times$10$^{-32}$ cm$^{2}$ to 2.3$\times$10$^{-29}$ cm$^{2}$ for $\chi$ of
1 keV to 24 MeV from PBHs with masses of 5$\times$10$^{15}$ g, as well as from
1.1$\times$10$^{-28}$ cm$^{2}$ to 7.6$\times$10$^{-28}$ cm$^{2}$ for $\chi$ of
1 keV to 0.6 MeV from PBHs with masses of 7$\times$10$^{16}$ g. If the
$\chi$-nucleon elastic-scattering cross section can be determined in the
future, the abundance of PBHs may be severely constrained by $\chi$
evaporation. With the lower threshold (160 eVee) of the CDEX-10 experiment
compared to the previously used experiments, this work allows for a better
reach at soft spectra produced by heavier PBHs, which demonstrates the vast
potential of such a technical route to pursue $\chi$ from larger PBHs with a
low threshold.
