The invention relates to the field of emergency flood fighting, specifically to a rapid emergency fighting method. The rapid emergency fighting method comprises the following steps: building an emergency fighting temporary bridge by using a modular portable bridge cage emergency fighting device, directly clamping a subsidence-preventing plate on a bridge leg supporting beam of the portable bridgecage emergency fighting device, and then performing a throwing operation by using the temporary bridge. The subsidence-preventing combined emergency fighting device used by the rapid emergency fighting method can be quickly assembled on site; a cage-leg temporary bridge is built at a breach; through use of the subsidence-preventing plate, the problems of a low bearing force and inclined instability of the quickly-built temporary bridge are solved; the dam breach can be effectively repaired within the first time; by rapid emergency fighting method, the transportation is light, convenient and fast, the construction steps are simple, and the application range is relatively wide.