This AC/ DC reactor is used to reduce the current pulse in the AC/DC circuit so as to ensure the continuous electrical flow when the inductance has reached a certain amount. Besides, it is also adopted to improve the input current waveform distortion caused by the capacitor filtering, reduce and prevent the damage to the rectifier bridge and the overheating of capacitance caused by the impulse current. Moreover, it also possesses the function of increasing the power factor, reducing the AC impulse to the DC busbar and limiting the transient voltage of the power grid