The invention provides an information transmission method and system based on a power system general service protocol. The method comprises the following steps: an automation device monitoring substation collects the operation information of the automation device in a substation; the substation forms an automation device operation information file in a CIM-E format based on the collected operationinformation; the substation sends an event message carrying a file name of the automation device operation information file to an automation device monitoring master station based on the power systemgeneral service protocol; the master station receives the event message and calls the automation device operation information file corresponding to the file name according to the file name in the event message; the substation sends the automation device operation information file to the master station; and the master station receives the automation device operation information file and parses thereceived automation device operation information file. By adoption of the method and the system, a timely and effective monitoring means is provided for the operation condition of the automation device in the substation for a scheduling terminal.