The utility model discloses an emergent emergency exits of big -and -middle -sized passenger train freshwater mussel formula, including the door frame, the automobile body side is located to rise window and footboard, door frame, the bottom of door frame and the lower border parallel and level of the outside covering of passenger train, and the footboard hinges in the bottom of door frame, and thewindow hinge that rises connects in the top of door frame, the window that rises during passenger train normal use folds in the door frame as the door window, and the footboard folds as the automobile body covering in the door frame, when emergent fleing, the footboard overturns downwards along the hinge, and the upwards upset of windowsill hinge of rising forms the passway for escaping. The utility model discloses low in manufacturing cost, to open convenience, time spent extremely short, practical reliable.