The invention discloses a low-frequency electromagnetic radiator with irrelative device size and wavelength size, which contains two structures, wherein the one structure has disc flat laminated capacitance structure and the others has cylinder shaped concentric circle multi-capacitance structure; the capacitance pole board and insulating dielectric of two structures adopt copper-clad laminate or tube of low-dielectric constant material, which makes the device size and wavelength size irrelative because the working frequency of two devices depends on themselves capacitance and paralleling inductance quantity.