A device for low-power bidirectional wireless data telemetry includes: a coil unit configured to perform forward telemetry and back telemetry; a full-wave rectifier unit configured to convert an AC voltage into a DC voltage; a current modulator configured to change a magnetic field by altering a path of the AC current generated, when the back telemetry is performed; an energy storage configured to generate a reuse power using the AC current; and a LDO unit configured to generate a source voltage using the power output from the full-wave rectifier unit and the reuse power generated by the energy storage. Accordingly, since the back telemetry and the forward telemetry may be performed simultaneously and the wasted current is reused, the power required for back telemetry may be reduced.