The embodiment of the invention provides a conference media stream control method and device, and the method comprises the steps: building a communication connection with a terminal participating in aconference; determining a conference role type to which the terminal participating in the conference belongs; and if the conference role type to which the terminal belongs is the first role type, sending an uploading prohibition instruction to the terminal, the uploading prohibition instruction being used for controlling the terminal to prohibit uploading of the media stream to the streaming media server. According to the conference media stream control method provided by the invention, the bandwidth load pressure of the streaming media server can be reduced, the fluency of the streaming media conference can be improved, and more terminals participating in the conference can be accommodated in comparison with the prior art under the condition that the bandwidth bearing capacity is constant.