The embodiment of the invention provides a high-power linear power amplifier, which comprises a signal conditioning circuit, which is used for processing an input signal and outputting the processed signal; a power amplification circuit, which is used for receiving the signal processed by the signal conditioning circuit, conducting power amplification processing on the signal processed by the signal conditioning circuit and outputting the amplified power signal; a microprocessor circuit, which is used for controlling the operation of the signal conditioning circuit and the power amplification circuit and setting the parameters of the signal conditioning circuit, wherein the power amplification circuit comprises a differential amplification circuit, which is used for amplifying the signal processed by the signal conditioning circuit; a buffer amplification circuit, which is used for again amplifying the signal output by the differential amplification circuit; and a parallel push-pull amplification circuit, which is used for conducting power amplification processing on the signal amplified by the buffer amplification circuit and outputting the amplified power signal. By using the power amplifier, higher frequency bandwidth and output power can be obtained.