The embodiment of the invention discloses an audio signal processing method and an audio signal processing device, is applied to the technical field of communication, and can solve the problem that aloudspeaker is damaged due to the fact that the vibration amplitude of the loudspeaker is overloaded. The method comprises the steps of generating a target amplitude set according to a target voltageset and a first parameter, wherein the target amplitude set comprises at least two amplitudes corresponding to at least two frequency bands, the target voltage set is a voltage set corresponding to afirst audio signal set of a loudspeaker to be input, and the first audio signal set comprises a first audio signal; Obtaining a second voltage according to the target amplitude set; Obtaining a firstgain coefficient according to the first voltage and the second voltage, the first voltage being an input voltage of the first audio signal; And processing the first audio signal according to the firstgain coefficient. The method is applied to an audio signal processing scene.