A three-phase reactor power saving device, comprising: a first capacitor set, connected electrically to a three-phase AC power supply, to store electric energy; a reactor set, connected electrically to said first capacitor set, to convert said electric energy into AC self-induced energy; a three-phase transformer, connected electrically to said reactor set, to boost said AC self-induced energy into boosted AC self-induced energy; a second capacitor set, connected electrically to said three-phase transformer, to store said boosted AC self-induced energy; a rectifier circuit, connected electrically to said three-phase transformer, to rectify current of said boosted AC self-induced energy into a DC current; a power regulating capacitor, connected electrically to said rectifier circuit; and a first DC reactor and a second DC reactor, connected electrically to said rectifier circuit, to output first DC self-induced energy and second DC self-induced energy to said load, to raise power saving efficiency.