Reconfigurable input matching adopted a L-shaped circuit structure, which was connected to a section of microstrip line through a single-pole single-throw switch circuit to realize automatic compensation of input impedance at different operating frequencies. The output matching realized concurrent dual-frequency work. The formula was re-derived on the basis of the early three-section microstrip line, and a four-section microstrip line structure in series that was easier to implement was proposed. The power amplifier adopted a reconfigurable structure combined with a concurrent dual-band matching network, so only one switch was used. The circuit structure was simple, and the switch had a small effect on circuit performance. The simulation results showed that the matching state and performance of the power amplifier were good, which provided an idea for designing the existing reconfigurable power amplifiers.