In contrast to the extensively verified Weyl semimetals with broken inversion symmetry, magnetic Weyl semimetals, which break time reversal symmetry, were only theoretically proposed (e.g. Y2Ir2O7, HgCr2Se4) , but none of them has been experimentally confirmed yet. Very recently, a new magnetic Weyl semimetal was proposed in the layered Kagomé-lattice Co3Sn2S2 with Weyl points near the Fermi energy, and a ferromagnetic transition around TC= 175 K in the half-metal state. Here we propose to do inelastic neutron scattering experiments on this first experimentally verified magnetic Weyl semimetal at MERLIN. The aim of this experiment is to search anomalous spin excitations related to the topological physics and spin-orbital coupling, i.e. magnetic monopoles or magneto-phonons, or renormalized spin excitations by the Weyl points in the ferromagnetic state.