The utility model relates to the field of communications and discloses a broadband power amplifier. In the utility model, the broadband power amplifier comprises a first amplifying circuit, a second amplifying circuit and a third amplifying circuit, wherein the first amplifying circuit, the second amplifying circuit and the third amplifying circuit are sequentially connected; the first amplifying circuit is a broadband amplifying circuit, the second amplifying circuit is a high Q-value narrowband-driven amplifying circuit, the third amplifying circuit is a broadband amplifying circuit, and the second amplifying circuit comprises a tuning circuit. The broadband power amplifier in the implementation mode of the utility model covers a broader frequency range on the premise of sacrificing less circuit performance (gain, output power and efficiency) by adopting a narrowband adjustable amplifier through a frequency band with broader frequency-modulated coverage, so that the coverage of enough frequency points is realized by utilizing fewer power amplifiers.