A differential power amplifier, comprising: an input matching network, a first-stage amplification circuit, a first inter-stage matching network, a second-stage amplification circuit, a second inter-stage matching network, a third-stage amplification circuit, and an output matching network; wherein the first-stage amplification circuit and the second-stage amplification circuit are single-ended input single-ended output circuits; the third-stage amplification circuit is a dual input dual output circuit; the second inter-stage matching network comprises a first transformer T1, a first capacitor C1, a second capacitor C2, a first inductor L1, and a second inductor L2; the output matching network comprises a second transformer T2; wherein an input end of the input matching network is connected with a single-ended radio frequency input signal RFin and an output end of the input matching network is connected with an input end of the first-stage amplification circuit; an output end of the first-stage amplification circuit is connected with an input end of the first inter-stage matching network; an output end of the first inter-stage matching network is connected with an input end of the second-stage amplification circuit; a first input end of the first transformer T1 is connected with an output end of the second-stage amplification circuit and a second input end of the first transformer T1 is connected with a power supply voltage Vcc2; the first transformer T1 converts a single-ended signal from the second-stage amplification circuit into a pair of differential signals; the pair of differential signals is respectively input to a first input end and a second input end of the third-stage amplification circuit; a first output end of the third-stage amplification circuit is connected with a first input end of the second transformer T2; a second output end of the third-stage amplification circuit is connected with a second input end of the second transformer T2; a first output end of the second transformer T2 is grounded, and a second output end of the second transformer T2 is configured to output a single-ended radio frequency output signal RFout; wherein a first end of the first capacitor C1 and a first end of the second capacitor C2 are respectively connected with the first input end of the first transformer T1 and the second input end of the first transformer T1; a second end of the first capacitor C1 and a second end of the second capacitor C2 are respectively grounded; a first end of the first inductor L 1 is connected with a first output end of the first transformer T1 and a first end of the second inductor L2 is connected with a second output end of the first transformer T1; a second end of the first inductor L1 and a second end of the second inductor L2 are respectively grounded. wherein the first-stage amplification circuit and the second-stage amplification circuit are single-ended input single-ended output circuits; the third-stage amplification circuit is a dual input dual output circuit; the second inter-stage matching network comprises a first transformer T1, a first capacitor C1, a second capacitor C2, a first inductor L1, and a second inductor L2; the output matching network comprises a second transformer T2; wherein an input end of the input matching network is connected with a single-ended radio frequency input signal RFin and an output end of the input matching network is connected with an input end of the first-stage amplification circuit; an output end of the first-stage amplification circuit is connected with an input end of the first inter-stage matching network; an output end of the first inter-stage matching network is connected with an input end of the second-stage amplification circuit; a first input end of the first transformer T1 is connected with an output end of the second-stage amplification circuit and a second input end of the first transformer T1 is connected with a power supply voltage Vcc2; the first transformer T1 converts a single-ended signal from the second-stage amplification circuit into a pair of differential signals; the pair of differential signals is respectively input to a first input end and a second input end of the third-stage amplification circuit; a first output end of the third-stage amplification circuit is connected with a first input end of the second transformer T2; a second output end of the third-stage amplification circuit is connected with a second input end of the second transformer T2; a first output end of the second transformer T2 is grounded, and a second output end of the second transformer T2 is configured to output a single-ended radio frequency output signal RFout; wherein a first end of the first capacitor C1 and a first end of the second capacitor C2 are respectively connected with the first input end of the first transformer T1 and the second input end of the first transformer T1; a second end of the first capacitor C1 and a second end of the second capacitor C2 are respectively grounded; a first end of the first inductor L 1 is connected with a first output end of the first transformer T1 and a first end of the second inductor L2 is connected with a second output end of the first transformer T1; a second end of the first inductor L1 and a second end of the second inductor L2 are respectively grounded.