The invention discloses a multi-display monitoring method and a multi-display monitoring device, which are used for monitoring and controlling single terminal equipment having a plurality of displays on one display and managing display contents on other displays. The method comprises the following steps: setting a slave screen monitoring window formed after scaling a second display screen according to a set scaling proportion on a first display screen; displaying a display interface of the second display screen on the slave screen monitoring window; and controlling the display interface of the second display screen through the slave screen monitoring window.