The invention discloses a synchronizing method and device between media streams. The method comprises the following steps: a plurality of multimedia devices synchronously starting respective own clock according to a synchronized system clock after synchronizing the system clocks; the plurality of multimedia devices performing the synchronization between the media streams according to the own clock. Through the adoption of the technical scheme disclosed by the invention, the synchronization reliability between the media streams is improved, and the user experience of an intelligent multimedia system is promoted.