One of the major challenging issues in lithium-sulfur (Li-S) batteries is that the lithium polysulfides easily dissolve in the electrolyte and shuttle between anode and cathode. To overcome this problem, an ideal anchoring materials is urgent. In the current work, we explore the potential application of BC₂N allotropes (approximated by Type-I and Type-II structures) as anchoring materials for Li-S batteries by using first-principles method with van der Waals interaction. Type-I is a direct-bandgap semiconductor, while type-II is semi-metallic due to inversion symmetry of its structure. They show remarkable but not too strong chemical interaction with S₈ and Li₂S_x clusters and enhanced electrical conductivity. In addition, the introduction of dopants and defects result in semiconductor-to-metal transition on type-I BC₂N, and enhancement of binding energies and still keep intact Li₂S_x clusters. Our findings demonstrate that defective and doped BC₂N monolayers are promising anchoring materials for Li-S batteries.