The embodiment of the present invention discloses a data transmission control method and a device, wherein the method comprises the steps of receiving the audio data sent by a master device via an internal network, and detecting a state parameter transmitted by the internal network when the audio data is played; determining whether the state parameter transmitted by the internal network satisfies a preset trigger condition used for triggering and switching to an external network to receive the audio data; if yes, switching a transmission path of the audio data into a transmission pat of the audio data received by the external network after the audio data is played. By implementing the data transmission control method and the device of the present invention, the transmission efficiency of the audio data can be improved.