Acoustic metamaterials have demonstrated great application potential in the fields of vibration and noise control. To suppress the broadband and low-frequency vibration in practical engineering, a novel design of the microunit is proposed, which uses a beam-type acoustic black hole (ABH) absorber as the resonator. By the coupling effects of ABH and the local resonance mechanism, a vibration attenuation band with relative bandwidth up to 0.93 can be generated. Furthermore, the microunit is used as the core layer embedded into a honeycomb raft plate, which is applied to the floating raft system. Due to the sandwich design, the stiffness of the novel metamaterial raft is improved. By analyzing the output vibration response of the foundation and the vibration level difference of the whole system, it shows a broadband and better vibration isolation performance, compared with the normal raft. In all, this study may provide a new idea for the design and application of vibration isolation meta-devices.