The present invention relates to an auxiliary stream transmission method based on a video conference system. The method integrates an auxiliary stream function into an auxiliary stream peripheral, a computer is connected to a master server of the video conference system through the auxiliary stream peripheral, and the master server and the auxiliary stream peripheral are connected through a network cable. In the present invention, the auxiliary stream peripheral and the master server are connected through a network cable, to improve flexibility of system deployment, and costs of the network cable are low, to correspondingly reduce deployment costs of the system.