Microwave power amplifier capable of realizing polarization mode selection

The invention discloses a microwave power amplifier capable of realizing polarization mode selection, which comprises a power divider, a first amplification branch consisting of a first phase shift control module and a first amplifier module, a second amplification branch consisting of a second phase shift control module and a second amplifier module, and a 90-degree bridge, a first signal and a second signal which are respectively generated by the power divider output to the first amplification branch and the second amplification branch are input to the 90-degree bridge, and radio frequency signal output is carried out by the horizontal polarized antenna and the vertical polarized antenna which are connected with the 90-degree bridge. The working states of the first amplifier module and the second amplifier module are controlled by controlling the phase shift quantity output of the first phase shift control module and the second phase shift control module, so that output control of circularly polarized waves, horizontal polarization, vertical polarization, linear polarization, left-hand circular polarization and right-hand circular polarization is realized, low-cost multi-polarization selection is realized, and the multi-polarization selection is realized. The problem of power loss during horizontal polarization and vertical polarization is solved.