A Doherty power amplifier comprises: a bandwidth divider, a bandwidth power amplification circuit, a broadband combination bridge and a non-linear phase network. The bandwidth power amplification circuit comprises a bandwidth main power amplifier and a broadband auxiliary power amplifier. The bandwidth divider separately connects to the input ends of the bandwidth main power amplifier and the broadband auxiliary power amplifier, and the output ends of the bandwidth main power amplifier and the broadband auxiliary power amplifier separately connect to the input end of the broadband combination bridge. An isolation port of the broadband combination bridge connects to the non-linear phase network. The output end of the broadband combination bridge is used for connecting a load. The non-linear phase network is used for regulating the required reflecting phase angle of the isolation port of the combining bridge on at least one working frequency section of the Doherty power amplifier. The amplifier can achieve a best working state at multiple working frequency sections, and has high broadband efficiency.
