The present invention relates to a coil-based electromagnetic wave resonance transfer device for improving energy efficiency, which comprises: a housing; an electronic circuit board which is installed in the housing and senses an external signal generated outside the housing, to generate an electric wave signal having a specific waveform, of which a frequency is adjusted by using a multi-frequency modulation method; and a coil member which is installed in the housing and generates a resonant magnetic field through the electric wave signal output from the electronic circuit board to output an electromagnetic resonance wave to the outside of the housing.