In this paper, we study the lepton number violation processes of $B_c$ meson induced by possible doubly-charged scalars. Both the three-body decay channels and the four-body decay channels are considered. For the former, $Brtimesleft(frac{s_Delta h_{ij}}{M_Delta^2}right)^{-2}$ is of the order of $10^{-7}sim 10^{-9}$, and for the later channels, $Brtimesleft(frac{s_Delta h_{ij}}{M_Delta^2}right)^{-2}$ is of the order of $10^{-12}sim 10^{-20}$, where $s_Delta$, $h_{ij}$, $M_Delta$ are the constants related to the doubly-charged boson.
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