The application discloses a power amplifier circuit and a formation method thereof and relates to the field of wireless communication, wherein the power amplifier circuit comprises a differential to single-end converter, a gain stage circuit, a driving stage circuit, and an output stage circuit, which are successively connected with one another, and a bias circuit which is connected to a bias voltage port of the gain stage circuit for adjusting a bias voltage of the gain stage circuit. According to the power amplifier circuit and the formation method thereof in the invention, bias voltage is provided for a bias voltage port of the gain stage circuit of the power amplifier circuit through the bias circuit; the bias voltage is adjustable; the deviation of processing temperature voltage can be prevented from influencing the performance of the power amplifier circuit; further, the efficiency of the power amplifier circuit can be improved in the case of ensuring low power consumption.