The present invention relates to a unit current transformer device and a magnetic induction power supplying device, and particularly to a magnetic induction power supply unit capable of linearly adjusting output power according to the number of unit current transformer devices configured to have a specific resonance frequency. To this end, the unit current transformer device includes a current transformer inducing secondary current from primary current flowing through a line in a magnetic induction manner and having a resonant frequency double or greater than that of the primary current, and a converting unit converting an output of the current transformer to DC power.