The invention provides a boron carbide ceramic plate which is formed by splicing ceramic chips. Graphene highly dispersed in the ceramic chips has excellent electroconductive, heat-conducting and mechanical performance and is a two-dimensional material, so that mutual attraction among graphene layers can be remarkably lowered through surface modification to avoid aggregation; graphene has high dispersity and stability in some liquid media, so that a graphene solution stable in dispersion can be prepared; a graphene-ceramic mixed raw material having good implanting effect can be obtained by mixing graphene with ceramic matrix size; graphene plays a role in strengthening and toughening through mechanisms of ceramic interface pinning, crack deflection inducing, bifurcating and crack bridging,graphene breaking and extracting and energy absorbing.