The invention discloses an emergency broadcast issuing and map-based selected area information transmission method and device. The emergency broadcast issuing method comprises the steps that an emergency broadcast platform generates a first closed graph of an area selected on a GIS map by the user according to multiple first boundary coordinate points transmitted by the geographic information GIS map; the emergency broadcast platform determines the overlapping ratio of a second closed graph corresponding to each administered area on the GIS map and the first closed graph; and the emergency broadcast platform transmits emergency broadcast information to emergency broadcast terminals of the administered areas corresponding to the second closed graphs of which the overlapping ratio with the first closed graph is greater than the preset value. With application of the method and the device, the emergency broadcast issuing efficiency can be enhanced.