The present invention relates to a power saving apparatus using a direct current reactor circuit for removing harmonics and to a power saving method thereof. A power saving apparatus having a function of improving power quality by removing harmonics generated from non-linear load comprises: a current limiter connected in parallel to the non-linear load so as to limit the current being input to the power saving apparatus; a rectifying device connected in series to the first current limiter so as to rectify the current applied thereto; and a reactance circuit connected to an output terminal of the rectifying device so as to smooth the pulsating current output from the rectifying device. The power saving apparatus and power saving method thereof according to the present invention have effects of preventing an increase in voltage and current caused by a resonance.