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Sandwich plates consisting of lattice-truss-cores have been extensively developed for high stiffness- and strength-to-density ratios. However, there are still challenges in achieving low-frequency vibration suppression and lightweight configuration, simultaneously, for the lattice-truss-core sandwich plates. By introducing the design philosophy of elastic metamaterials, we propose single- and binary-phase meta-lattice sandwich plates to realize wide bandgaps within low-frequency ranges. The additive manufacturing technique of selective laser sintering (SLS) is applied to fabricate the dissipative meta-composite structures. The vibration attenuation characteristics are theoretically, numerically, and experimentally investigated. Dramatical vibration suppression within ultra-wide bandgaps are experimentally captured in both time and frequency domains. The normalized frequency illustrates that meta-lattice unit cells are much smaller than the wavelength. The coupling effect between the designed secondary structures and host panels, which is related to the bandgap generation, are systematically discussed. The equivalent mass-spring-damper models are developed to theoretically predict the vibration attenuation ranges, and the results obtained by the simplified models show excellent agreement with the simulations. We further investigate the damping effects of the dissipative meta-structures on the vibration attenuation performance. Remarkably enlarged and integrated attenuation bands are captured by virtue of the damping-induced bandgap merging effect. The metamaterial-based lattice plates could be a prospective method for the design of multifunctional lattice structures with superior mechanical, vibration isolation and lightweight performance.