Predistortion linearizer and application of the predistortion linearizer

The invention discloses a predistortion linearizer. The predistortion linearizer comprises a first branch line coupler which is configured for inputting a signal by a first input end in a direction equal to an input signal, then directly outputting the signal by a first straight through end and outputting the signal from a first coupling end, wherein the signal output from the first coupling end has uniform amplitude with the signal output from the first straight through end, the direction of the signal output from the first coupling end is opposite to that of the signal output from the first straight through end. The predistortion linearizer also comprises a first nonlinearity generator which is configured for generating a curve of which amplitude and phase are extended at the same time and outputting a first way of signal; a second nonlinearity generator which is configured for generating the curve of which amplitude and phase are extended at the same time and outputting a second way of signal; and a power