The invention provides a micro-nano thin film magnetosonic antenna comprising a pedestal. The middle portion of the upper surface of the pedestal is provided with a cavity; the bottom and the side wall of the cavity and the upper surface of the pedestal are provided with insulation layers connected to a whole; a supporting layer is arranged on the insulation layer on the upper surface of the pedestal; the middle portion of the supporting layer is arranged over the cavity in a suspended manner; a magnetism-sound-electricity coupled structure consisting of magnetostrictive thin films and a thinfilm bulk acoustic wave resonator is arranged on the supporting layer; the magnetism-sound-electricity coupled structure is located right above the cavity; each magnetostrictive thin film consists ofmultiple magnetostrictive thin film layers and multiple buffer layers, wherein the number of the magnetostrictive thin film layers and the number of the buffer layers are the same and the magnetostrictive thin film layers and the buffer layers are arranged in an alternate manner. While being miniaturized, the antenna has better performance than conventional electric antennas.