<p>Wave propagation plays a critical role in the performance and functionality of micro/nanoelectromechanical systems (MEMs/NEMs). These systems’ ability to accurately detect and transmit mechanical waves at the micro/nanoscale is essential for sensing, communications, and energy harvesting applications. Accordingly, this study examines the 3D wave propagation in a laminated nanoplate (LNP), including bending, shear, and longitudinal waves, using nonlocal strain gradient (NSGT) and higher-order shear deformation (HSDT) theories. The proposed nanoplate comprises a Ti6Al4V auxetic core layer between magneto-electro-elastic (MEE) surface layers comprised of the volumetric combinations of cobalt-ferrite (CoFe₂O₄) and barium-titanate (BaTiO₃) materials. Also, the temperature dependency of all LNP materials is considered. Hamilton’s principle is employed to derive the nanoplate’s motion equations, and Navier’s method is employed to assess the system’s response. The effects of several cases, such as the auxetic core’s geometric parameters, the face layer’s MEE material content, as well as thermal, electric, magnetic, and size effects, on the wave propagation response, including phase velocity and wave frequency, are analysed through analytical computations. The research findings show that the LNP’s 3D wave propagation characteristics can be modified with geometrical and material parameters, as well as external effects. Therefore, the proposed LNP structure is anticipated to protect MEMs/NEMs operating in higher frequency and temperature environments and advance intelligent sensors, offering benefits such as temperature sensitivity, lightweight design, and applicability in wearable health equipment.</p>