The fabrication of nanocomposite structures for Nano-Optics is facing many challenges due to the special performance requirements. In this work, a novel Ag nanoprism@SiO2@QD composite nanostructure is designed and fabricated to meet the desire of optical experiments. This material has good morphology and high monodispersity, and quantum dots can stably attach to the silica layer through chemical bonds. Simulation results confirm that this nanostructure can generates a Rabi splitting with a maximum value of 112 meV. Our coupling system creates a new combination of Ag nanoprisms and quantum dots, providing a high performance nanostructure for future photonic systems.