Disclosed are a method for transmitting a media data stream and a thin client, and the method includes: a media channel is established between a first thin client and a second thin client, wherein a first media module is pre-configured in the first thin client and a second media module is pre-configured in the second thin client; and the media data stream is transmitted between the first media module pre-configured in the first thin client and the second media module pre-configured in the second thin client through the media channel. The present disclosure solves problems of network time delay and data distortion caused by a fact in the prior art that media data need to be transmitted between a thin client and a virtual desktop through using a protocol such as RDP so as to implement interaction of data between two thin clients, thus achieving technical effectives of improvement on the data transmission rate and accuracy of data.