Aline driving apparatus, comprising: a signal output module, a first power supply module, a second power supply module, and a line driving module, wherein the first power supply module is connected to the signal output module and a first input end of the line driving module; the second power supply module is connected to the signal output module and the first input end of the line driving module; a second input end of the line driving module is connected to the signal output module; the signal output module is configured to output a first signal to the first power supply module, output a second signal to the second power supply module, and output a third signal to the line driving module, wherein the first signal is a digital signal or an analog signal of a to-be-processed voltage signal, the second signal is a digital signal or an analog signal of the to-be-processed voltage signal, and the third signal is a digital signal or an analog signal of the to-be-processed voltage signal; the first power supply module is configured to receive the first signal, generate a corresponding first voltage based on an amplitude of the first signal at each moment, and output the first voltage to the line driving module through the first input end of the line driving module, wherein an amplitude of the first voltage at any moment is greater than an amplitude of the first signal at the moment, and a difference between the amplitude of the first voltage at any moment and the amplitude of the first signal at the moment is within a specified range; the second power supply module is configured to: receive the second signal; determine whether an absolute value of an amplitude of the second signal is greater than or equal to a specified threshold; if the absolute value of the amplitude of the second signal is greater than or equal to the specified threshold, generate a second voltage based on the amplitude of the second signal, and output the second voltage to the line driving module through the first input end of the line driving module; and if the absolute value of the amplitude of the second signal is less than the specified threshold, output no signal, wherein an amplitude of the second voltage is greater than the amplitude of the second signal; and the line driving module is configured to receive the third signal, and perform power amplification on the third signal based on the first voltage and the second voltage. the first power supply module is connected to the signal output module and a first input end of the line driving module; the second power supply module is connected to the signal output module and the first input end of the line driving module; a second input end of the line driving module is connected to the signal output module; the signal output module is configured to output a first signal to the first power supply module, output a second signal to the second power supply module, and output a third signal to the line driving module, wherein the first signal is a digital signal or an analog signal of a to-be-processed voltage signal, the second signal is a digital signal or an analog signal of the to-be-processed voltage signal, and the third signal is a digital signal or an analog signal of the to-be-processed voltage signal; the first power supply module is configured to receive the first signal, generate a corresponding first voltage based on an amplitude of the first signal at each moment, and output the first voltage to the line driving module through the first input end of the line driving module, wherein an amplitude of the first voltage at any moment is greater than an amplitude of the first signal at the moment, and a difference between the amplitude of the first voltage at any moment and the amplitude of the first signal at the moment is within a specified range; the second power supply module is configured to: receive the second signal; determine whether an absolute value of an amplitude of the second signal is greater than or equal to a specified threshold; if the absolute value of the amplitude of the second signal is greater than or equal to the specified threshold, generate a second voltage based on the amplitude of the second signal, and output the second voltage to the line driving module through the first input end of the line driving module; and if the absolute value of the amplitude of the second signal is less than the specified threshold, output no signal, wherein an amplitude of the second voltage is greater than the amplitude of the second signal; and the line driving module is configured to receive the third signal, and perform power amplification on the third signal based on the first voltage and the second voltage.