A pop sound suppression method, applied to an audio output circuit in an alternating current coupling structure, wherein the audio output circuit comprises an output power amplifier (OUTPUT PA), a common-mode voltage buffer, a reference voltage generation circuit, a powered-on pop sound suppression switch, and a common-mode switch, the reference voltage generation circuit is coupled to the common-mode voltage buffer, the powered-on pop sound suppression switch is coupled between an output node of the output power amplifier and a local ground, and the common-mode switch is coupled between the output node of the output power amplifier and an output of the common-mode voltage buffer; and the method comprises: in a power-on process of the audio output circuit, closing the powered-on pop sound suppression switch at a first moment to enable a voltage level of the output node to be zero; and when a reference voltage of the reference voltage generation circuit is zero, close the common-mode switch at a second moment, wherein the second moment is later than the first moment; wherein after the common-mode switch is closed, when the reference voltage of the reference voltage generation circuit is zero, at the second moment, to enable the voltage level of the output node to be zero, the method further comprises: opening the powered-on pop sound suppression switch at a third moment, wherein the third moment is later than the second moment; controlling the reference voltage of the reference voltage generation circuit to rise from zero to a common-mode voltage, to enable the voltage level of the output node to rise from zero to the common-mode voltage within preset duration; and starting the output power amplifier, and driving, by using the reference voltage generation circuit, the output node to be at the common-mode voltage within the preset duration. in a power-on process of the audio output circuit, closing the powered-on pop sound suppression switch at a first moment to enable a voltage level of the output node to be zero; and when a reference voltage of the reference voltage generation circuit is zero, close the common-mode switch at a second moment, wherein the second moment is later than the first moment; wherein after the common-mode switch is closed, when the reference voltage of the reference voltage generation circuit is zero, at the second moment, to enable the voltage level of the output node to be zero, the method further comprises: opening the powered-on pop sound suppression switch at a third moment, wherein the third moment is later than the second moment; controlling the reference voltage of the reference voltage generation circuit to rise from zero to a common-mode voltage, to enable the voltage level of the output node to rise from zero to the common-mode voltage within preset duration; and starting the output power amplifier, and driving, by using the reference voltage generation circuit, the output node to be at the common-mode voltage within the preset duration. opening the powered-on pop sound suppression switch at a third moment, wherein the third moment is later than the second moment; controlling the reference voltage of the reference voltage generation circuit to rise from zero to a common-mode voltage, to enable the voltage level of the output node to rise from zero to the common-mode voltage within preset duration; and starting the output power amplifier, and driving, by using the reference voltage generation circuit, the output node to be at the common-mode voltage within the preset duration.