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We report on linear magnetoelectric effect observed by the static electricpolarization measurements in external magnetic field up to 12 T on topologicalmultidomain antiferromagnet Cu$_3$TeO$_6$. The polarization is non-zero onlybelow the N\'{e}el temperature and for $\mathbf{E}\perp \mathbf{H}$. Themagnetization data show spin reorientation taking place already in $H<$1 T.This is fully captured by the anisotropic Heisenberg spin Hamiltonian,revealing the change of the magnetic point group from $\bar{3}$' in the groundstate to $m$ in the applied magnetic field, in agreement with the observedmagnetoelectric effect. Both point groups allow the ferrotoroidic order whichcould be a source of magnetoelectric effect in this system. Our resultsestablish Cu$_3$TeO$_6$ as a playground for the study of magnetoelectrictopological antiferromagnets and a host of several phenomena which are ofinterest for future spintronic devices.

Linear Magnetoelectric Effect in Topological Antiferromagnet Cu$_3$TeO$_6$