The present invention provides a multiband power amplification apparatus, so as to consider both efficiency improvement and a linearity requirement. The apparatus further includes a first input terminal, a second input terminal, a first adjustment module, a second adjustment module, a first adder, and a second adder, where the first input terminal receives a signal in a frequency band f 1 and then outputs the signal in the frequency band f 1 to a first digital predistortion module; the second input terminal receives a signal in a frequency band f 2 and then outputs the signal in the frequency band f 2 to a second digital predistortion module; the first adjustment module adjusts a first channel of signal and then outputs an adjusted first channel of signal to the first adder; the second adjustment module adjusts a third channel of signal and then outputs an adjusted third channel of signal to the first adder; the first adder converges the signal adjusted by the second adjustment module and the signal output by the first adjustment module and then outputs a converged signal to a first digital-to-analog converter; and the second adder converges a second channel of signal and a fourth channel of signal and then outputs a converged signal to a second digital-to-analog converter. According to the apparatus, design performance of an inter-band power amplifier can be improved, types of power amplifiers can be reduced, and costs can be reduced.