The invention discloses a multimedia interconnected teaching system and an interconnecting method for the multimedia interconnected teaching system, and relates to the technical field of teaching equipment. With the system, a lecturer can capture the key points of a course for the audience during the remote lecturing process. The multimedia interconnected teaching system comprises a display, a processor, a cloud server and a client-side, wherein the display is used for displaying an image; the processor is used for controlling the image output of the display; the cloud server is used for remotely transmitting the image displayed by the display and the image captured by the processor; the client-side is used for displaying the image remotely transmitted by the cloud server; and after the processor receives a remote sharing instruction, through the image which is displayed by the display and remotely transmitted by the cloud server, the client-side and the display are enabled to synchronously display the image, and when the processor inputs a screenshot sharing instruction, the processor captures the image displayed by the display at the moment and sends the image to the client-sidethrough the cloud server.