The present invention is applicable to the field of an LED display screen, and provides a method and device for separating a rebroadcasted video from a live display video, the method includes: feeding the rebroadcasted video and the live display video of the LED display screen into a video processor by two paths; completing an aliasing of two paths of the videos through the video processor, sending the aliased video to a LED display control system; controlling by the LED display control system a video ratio of the two paths of the videos, utilizing a high-speed camera to synchronously capture the rebroadcasted video according to the video ratio; receiving by the LED display control system the rebroadcasted video synchronously captured by the high-speed camera; and transforming by the LED display control system through image processing the rebroadcasted video into a video which is to be rebroadcasted to different countries. The present invention has the following two technical effects: on one hand, the present invention realizes the separation of the rebroadcasted video of the LED display screen from the live display video thereof around a stadium and meets different needs of different countries; on the other hand, the present invention is compatible with the LED video display technology in the prior art and can achieve a multi-purpose screen.