This study utilizes Monte Carlo simulations based on the Metropolis algorithm to delve into the dielectric properties of a hexagonal boron nitride nanolattice with mixed spins S-1 and σ-7/2. Initially it displays the phase diagram of the structure. Then, it examines the impact of the coupling interaction Jsσ, the external electric field Ez and the crystal field D on the system's polarization, dielectric susceptibility and the blocking temperature TB. Furthermore, the research explores the influence of Jσ, Ez, D and T on the hysteresis cycles and the coercive electric field Ec. The results reveal the distinguished dielectric properties of the hexagonal boron nitride nanolattice, which could be advantageous for a variety of nano-technological applications across flexible electronics, energy storage, nanophotonics, quantum computing, spintronics and sensing technologies.