A Doherty power amplifier circuit, comprising a power distributor, a carrier amplifier branch, a peak amplifier branch, and a combiner, wherein: a series resonator circuit is arranged between the carrier amplifier branch and the combiner, and configured to: appear inductive when an operating frequency of the Doherty power amplifier circuit is higher than a central frequency, appear capacitive when the operating frequency of the Doherty power amplifier circuit is lower than the central frequency, and have an impedance of 0 when the operating frequency of the Doherty power amplifier circuit is the central frequency; wherein the carrier amplifier branch comprises a first input matching circuit, a carrier amplifier transistor, a first output matching circuit, and a first offset line with a characteristic impedance equal to 50 ohms, all of which are connected in series, wherein one end of the first offset line is connected with the series resonator circuit; and wherein the combiner comprises a first λ/4 impendence conversion line with a characteristic impendence equal to 50 ohms, a second λ/4 impendence conversion line with a characteristic impendence equal to 50 1 + a ohms, and a first load with a resistance equal to 50 ohms, all of which are connected in series, wherein two ends of the first λ/4 impendence conversion line are connected respectively with the series resonator circuit and the peak amplifier branch; and the peak amplifier branch comprises a second offset line with a characteristic impedance equal to 50 ohms, a second input matching circuit, a peak amplifier transistor, a second output matching circuit, a third λ/4 impendence conversion line with a characteristic impedance equal to 50 a ohms, and a third offset line with a characteristic impedance equal to 50 a ohms, all of which are connected in series, wherein one end of the second offset line is connected with the power distributor, and one end of the third offset line is connected with the combiner; wherein λ represents a wavelength of an impendence conversion line, and a represents a maximum output capacity of the peak amplifier transistor divided by a maximum output capacity of the carrier amplifier transistor. a series resonator circuit is arranged between the carrier amplifier branch and the combiner, and configured to: appear inductive when an operating frequency of the Doherty power amplifier circuit is higher than a central frequency, appear capacitive when the operating frequency of the Doherty power amplifier circuit is lower than the central frequency, and have an impedance of 0 when the operating frequency of the Doherty power amplifier circuit is the central frequency; wherein the carrier amplifier branch comprises a first input matching circuit, a carrier amplifier transistor, a first output matching circuit, and a first offset line with a characteristic impedance equal to 50 ohms, all of which are connected in series, wherein one end of the first offset line is connected with the series resonator circuit; and wherein the combiner comprises a first λ/4 impendence conversion line with a characteristic impendence equal to 50 ohms, a second λ/4 impendence conversion line with a characteristic impendence equal to 50 1 + a ohms, and a first load with a resistance equal to 50 ohms, all of which are connected in series, wherein two ends of the first λ/4 impendence conversion line are connected respectively with the series resonator circuit and the peak amplifier branch; and the peak amplifier branch comprises a second offset line with a characteristic impedance equal to 50 ohms, a second input matching circuit, a peak amplifier transistor, a second output matching circuit, a third λ/4 impendence conversion line with a characteristic impedance equal to 50 a ohms, and a third offset line with a characteristic impedance equal to 50 a ohms, all of which are connected in series, wherein one end of the second offset line is connected with the power distributor, and one end of the third offset line is connected with the combiner; wherein λ represents a wavelength of an impendence conversion line, and a represents a maximum output capacity of the peak amplifier transistor divided by a maximum output capacity of the carrier amplifier transistor.