A power-saving circuit for a contactor, comprising a coil drive circuit, further comprising a rectification and filtering circuit, a PFC circuit, an auxiliary power supply circuit and a square wave generation circuit, wherein the square wave generation circuit outputs a first square wave signal to the PFC circuit via a first output end according to a set timing sequence, and outputs a second square wave signal and a third square wave signal to the coil drive circuit via a second output end, so as to respectively control duty cycles of a first switch tube in the PFC circuit and a second switch tube in the coil drive circuit; the auxiliary power supply circuit supplies electric energy to the square wave generation circuit during a holding stage of the contactor; the rectification and filtering circuit is used for rectifying an input AC into a pulsating DC, and filtering an input narrow-pulse current into a smooth current to be outputted to the PFC circuit after eliminating higher harmonic components other than a fundamental frequency component of 50 Hz; the PFC circuit receives rectified and filtered electric energy, enables an effective value of the input current to change along with an input voltage, and outputs the input current to the coil drive circuit and the auxiliary power supply circuit; the coil drive circuit is used for controlling a current of a contactor coil; wherein, during a pull-in stage of the contactor, the PFC circuit does not work and the power-saving circuit provides a large current to the contactor coil to pull in; during a transition stage, the PFC circuit starts to work and the power-saving circuit controls the current of the contactor coil to decrease gradually; and during a holding stage of the contactor, the PFC circuit keeps working and the power-saving circuit controls the current of the contactor coil to be kept as a small current required for holding, characterized in that the rectification and filtering circuit comprises an inductor, a rectifying bridge and a first capacitor which are connected in such a relationship that the inductor is connected in series between an input end of the AC and an input end of the rectifying bridge, and an output end of the rectifying bridge and the first capacitor are connected in parallel to lead out as output ends of the rectification and filtering circuit, and that the PFC circuit comprises a transformer, wherein, the inductor of the rectification and filtering circuit and a selection parameter of the transformer of the PFC circuit are designed according to power of the contactor holding stage, and during a pull-in stage of the contactor, both the inductor and the transformer are in a saturation state. wherein the square wave generation circuit outputs a first square wave signal to the PFC circuit via a first output end according to a set timing sequence, and outputs a second square wave signal and a third square wave signal to the coil drive circuit via a second output end, so as to respectively control duty cycles of a first switch tube in the PFC circuit and a second switch tube in the coil drive circuit; the auxiliary power supply circuit supplies electric energy to the square wave generation circuit during a holding stage of the contactor; the rectification and filtering circuit is used for rectifying an input AC into a pulsating DC, and filtering an input narrow-pulse current into a smooth current to be outputted to the PFC circuit after eliminating higher harmonic components other than a fundamental frequency component of 50 Hz; the PFC circuit receives rectified and filtered electric energy, enables an effective value of the input current to change along with an input voltage, and outputs the input current to the coil drive circuit and the auxiliary power supply circuit; the coil drive circuit is used for controlling a current of a contactor coil; wherein, during a pull-in stage of the contactor, the PFC circuit does not work and the power-saving circuit provides a large current to the contactor coil to pull in; during a transition stage, the PFC circuit starts to work and the power-saving circuit controls the current of the contactor coil to decrease gradually; and during a holding stage of the contactor, the PFC circuit keeps working and the power-saving circuit controls the current of the contactor coil to be kept as a small current required for holding, characterized in that the rectification and filtering circuit comprises an inductor, a rectifying bridge and a first capacitor which are connected in such a relationship that the inductor is connected in series between an input end of the AC and an input end of the rectifying bridge, and an output end of the rectifying bridge and the first capacitor are connected in parallel to lead out as output ends of the rectification and filtering circuit, and that the PFC circuit comprises a transformer, wherein, the inductor of the rectification and filtering circuit and a selection parameter of the transformer of the PFC circuit are designed according to power of the contactor holding stage, and during a pull-in stage of the contactor, both the inductor and the transformer are in a saturation state.