In　this　paper,　we　propose　a　scheme　to　achieve　a　multiphonon-resonance　quantum　Rabi　model　and　adiabatic　passage　in　a　strong-coupling　cavity　optomechanical　system.　In　the　scheme,　when　the　driving　bichromatic　laser　beam　is　adjusted　to　the　off-resonant　j-order　red-　and　blue-sideband,　the　interaction　between　the　cavity　and　mechanical　oscillator　leads　to　a　j-phonon　resonance　quantum　Rabi　model.　Moreover,　we　show　that　there　exists　a　resonant　multi-phonon　coupling　via　intermediate　states　connected　by　counter-rotating　processes　when　the　frequency　of　the　simulated　bosonic　mode　is　near　a　fraction　of　the　transition　frequency　of　the　simulated　two-level　system.　As　a　typical　example,　we　theoretically　analyze　the　two-phonon　resonance　quantum　Rabi　model,　and　derive　an　effective　Hamiltonian　of　the　six-phonon　coupling.　Finally,　we　present　a　method　of　six-phonon　generation　based　on　adiabatic　passage　across　the　resonance.　Numerical　simulations　confirm　the　validity　of　the　proposed　scheme.　Theoretically,　the　proposed　scheme　can　be　extended　to　the　realization　of　3j-phonon　state.