The Bose-Einstein condensation (BEC) of the two-dimensional (2D) magnetoexciton-polaritons in microcavity, when the Landau quantization of the electron and hole states accompanied by the Rashba spin-orbit coupling plays the main role, were investigated. The Landau quantization levels of the 2D heavy holes with nonparabolic dispersion law and third order chirality terms both induced by the external electric field perpendicular to the semiconductor quantum well as the strong magnetic field B gives rise to the nonmonotous dependence on B of the magnetoexciton energy levels and of the polariton energy branches. The Hamiltonian describing the Coulomb electron - electron and the electron - radiation interactions was expressed in terms of the two-particle integral operators such as the density operators $hat{rho}(vec{Q})$ and $hat{D}(vec{Q})$ representing the optical and the acoustical plasmons and the magnetoexciton creation and annihilation operators $Psi_{ex}^{dagger}({{vec{k}}_{||}}),Psi_{ex}^{{}}({{vec{k}}_{||}})$ with in - plane wave vectors ${{vec{k}}_{||}}$ and $vec{Q}$. The polariton creation and annihilation operators $L_{ex}^{dagger}({{vec{k}}_{||}}),L_{ex}^{{}}({{vec{k}}_{||}})$ were introduced using the Hopfield coefficients and neglecting the antiresonant terms because the photon energies exceed the energy of the cavity mode. The BEC of the magnetoexciton - polariton takes place on the lower polariton branch in the point ${{vec{k}}_{||}}=0$ with the quantized value of the longitudinal component of the light wave vector, as in the point of the cavity mode.
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