A magnetic induction power supplying unit apparatus comprising: a plurality of unit current transformer devices for linearly adjusting output power, each comprising: a current transformer connected to a line indirectly and detachably, and configured to induce current by using a magnetic field in the line, and a converting unit converting an output of the current transformer to DC power, wherein each converting unit includes: a primary voltage rectifying unit converting the induced current by the current transformer to a DC voltage; a current converting unit converting the converted DC voltage by the primary voltage rectifying unit to a current; and a secondary current rectifying unit converting the converted current by the current converting unit to a DC current; wherein the current has a resonant frequency double or greater than that of the current flowing through the line; wherein the apparatus further comprises: a summing unit configured to sum each of the DC currents output from each of the plurality of unit current transformer devices and outputting the summed DC currents; wherein an output by the summing unit is linearly proportional to the number of the plurality of unit current transformer devices. a current transformer connected to a line indirectly and detachably, and configured to induce current by using a magnetic field in the line, and a converting unit converting an output of the current transformer to DC power, wherein each converting unit includes: a primary voltage rectifying unit converting the induced current by the current transformer to a DC voltage; a current converting unit converting the converted DC voltage by the primary voltage rectifying unit to a current; and a secondary current rectifying unit converting the converted current by the current converting unit to a DC current; wherein the current has a resonant frequency double or greater than that of the current flowing through the line; wherein the apparatus further comprises: a summing unit configured to sum each of the DC currents output from each of the plurality of unit current transformer devices and outputting the summed DC currents; wherein an output by the summing unit is linearly proportional to the number of the plurality of unit current transformer devices. a primary voltage rectifying unit converting the induced current by the current transformer to a DC voltage; a current converting unit converting the converted DC voltage by the primary voltage rectifying unit to a current; and a secondary current rectifying unit converting the converted current by the current converting unit to a DC current; wherein the current has a resonant frequency double or greater than that of the current flowing through the line; wherein the apparatus further comprises: a summing unit configured to sum each of the DC currents output from each of the plurality of unit current transformer devices and outputting the summed DC currents; wherein an output by the summing unit is linearly proportional to the number of the plurality of unit current transformer devices. a summing unit configured to sum each of the DC currents output from each of the plurality of unit current transformer devices and outputting the summed DC currents; wherein an output by the summing unit is linearly proportional to the number of the plurality of unit current transformer devices.