  The top-Higgs coupling plays an important role in particle physics and
cosmology. The precision measurements of this coupling can provide an insight
to new physics beyond the Standard Model. In this paper, we propose to use
Message Passing Neural Network (MPNN) to reveal the CP nature of top-Higgs
interaction through semi-leptonic channel $pp \to t(\to
b\ell^-\nu_\ell)\bar{t}(\to \bar{b}jj)h(\to b\bar{b})$. Using the test
statistics constructed from the event classification probabilities given by the
MPNN, we find that the pure CP-even and CP-odd components can be well
distinguished at the LHC, with at most 300 fb$^{-1}$ experimental data.
