  The scenario of multi-sector SUSY breaking predicts pseudo-goldstinos which
are not absorbed by the gravitino and their mass can be as low as ${{\cal O}
(0.1)}$ GeV. Since the interactions of pseudo-goldstinos are not so weak as
gravitino, a produced higgsino can decay to a pseudo-goldstino plus a Higgs
boson insider the detector at the LHC, and thus the higgsino pair production
can lead to the signal of Higgs pair plus missing energy. For the scenario of
natural SUSY which requires rather light higgsinos, such events may sizably
outnumber the Higgs pair events predicted by the SM and be accessible at the
HL-LHC (14 TeV with a luminosity of 3~$\rm{ab}^{-1}$). In this work we examine
the observability of such Higgs pair plus missing energy from the decay of
light higgsinos produced at the HL-LHC. Considering three channels of the
Higgs-pair decay ($bbWW^*$, $bb\gamma\gamma$, $bbbb$), our detailed Monte Carlo
simulations for the signal and backgrounds show that the best channel is
$bbbb+\textrm{E\!\!\!\! \!\slash}_T$, whose statistical significance can reach
$2\sigma$ level for a light higgsino allowed by current experiments. This is
over the SM Higgs pair result which is about $1.8\sigma$.
