Abstract: A low-frequency multiferroic mechanical antenna amplified with a multifunctional metamaterial beam is provided, relating to the technical field of antennas. The array includes multiple unit arrays each consisting of a strong-hysteresis piezomagnetic layer, a high-magnetic-permeability piezomagnetic film unit, and a piezoelectric layer, a grid-shaped shuttle composite beam with variable stiffness that is composed of a first elastic substrate, a flexible piezoelectric material PVDF layer, and a second elastic substrate, a permanent magnet, an energy harvesting circuit, and a negative resistance circuit.