The invention relates to an audio power amplifier which comprises a biasing circuit, an amplification circuit and a time delay circuit, wherein the biasing is electrically connected with the amplification circuit and provides bias voltage for the normal work of the amplification circuit, and the time delay circuit is electrically connected with the biasing circuit and is used for delaying the biasing circuit to output the bias voltage to the amplification circuit. The audio power amplifier is additionally provided with the time delay circuit, thus, the time that the biasing circuit outputs the bias voltage required by the normal work of the amplification circuit to the amplification circuit is delayed so as to effectively reduce the noise when the audio power amplifier is started.