The invention discloses a processing method, a processing device and a processing system for screen capture of a log, which belong to the technical field of the Internet, wherein the processing method for the screen capture of the log comprises: capture data information corresponding to the graph-text content of a selected area in a page to be captured is obtained according to a screen capture request sent when a log file is edited; and the graph-text content corresponding to the capture data information is sent, and is used for adding the graph-text content into the currently edited log file. The processing method solves the problem that the blog journal function provided by prior network service providers fails to conveniently and quickly add a picture into the log through the screen capture, satisfies the demand that a user quickly obtains the picture in a web page to serve as the log content, is greatly convenient for the user to the use, and ensures better user experience.