The utility model discloses an intelligent amplifying circuit for a multimedia sound box. The intelligent amplifying circuit comprises a toning circuit and a power amplifier. The intelligent amplifying circuit for the multimedia sound box is characterized in that the amplifying circuit further comprises a voice-frequency band-pass filter and a timing module; the toning circuit is respectively connected to an output end of the voice-frequency band-pass filter and an input end of the power amplifier; and a signal output end of the timing module is connected to a signal receiving end of the toning circuit. Radio frequency pollution is filtered by the connected voice-frequency band-pass filter, thereby increasing the tone quality. The timing module is connected to the toning circuit, thereby being capable of controlling the sound volume at regular time and avoiding influencing the rest of other people.