A message sending method and device, and a code stream processing method and device are provided. In the message sending method, a first server acquires and caches a code stream which is the same as a code stream of a second server; the first server acquires an initial position for sending the code stream; and after the second server stops sending the code stream, the first server constructs a message corresponding to the code stream, and sends the message starting from the initial position according to a source Internet Protocol (IP) address of the second server.