The invention discloses a television picture and peripheral sound synchronous control method. The method comprises the following steps: decoding image signals and sound signals in a target code stream, extracting a sound amplitude peak of the decoded sound signals within a target time period, transmitting the sound signals to a peripheral and playing the sound signals; acquiring ambient sound and extracting an ambient sound amplitude peak within the target time period; comparing the extracted decoded sound amplitude peak and the ambient sound amplitude peak, and calculating a time difference between playing of television pictures and the sound which is transmitted to and played by the peripheral; and in accordance with the time difference, controlling delayed output of television image signals. The invention also discloses a television picture and peripheral sound synchronous control device. The circumstance that television pictures and peripheral sound are not synchronous at present is effectively avoided, user's seeing and hearing experience is improved and user experience is enhanced.