The invention discloses a method, device and system for in-sequence live streaming, belonging to the technical field of computers. The method includes receiving a terminal type of a streamer terminal sent by the streamer terminal during the in-sequence live streaming; determining a target transcoding mode corresponding to the terminal type of the streamer terminal according to the pre-stored corresponding relation between the terminal type and the transcoding mode; and receiving live streaming data sent by the streamer terminal, transcoding the live streaming data according to the target transcoding mode, and sending the transcoded live streaming data to a viewer terminal of a live streaming room to which the streamer terminal belongs. By the invention, the user can use the mobile terminal to conduct in-sequence live streaming.