Emergency vent valve special for railway transportation shunting operation

The utility model relates to an emergency vent valve special for railway transportation shunting operation in the technical field of vent valves, which comprises a main valve body, an air inlet and an emergency air outlet are arranged on the main valve body, the air inlet is used for being communicated with a train pipe, an emergency cavity is arranged in the main valve body, the air inlet is communicated with the emergency cavity through an air inlet channel, and the emergency air outlet is communicated with the emergency cavity through an air outlet channel. The emergency exhaust outlet is communicated with the emergency cavity through the first exhaust channel, and a plugging assembly for controlling the first exhaust channel to be opened and closed is arranged in the emergency cavity; the plugging assembly comprises a valve plate, a reset spring and an exhaust hole which are matched with one another. Due to the structural arrangement of the plugging assembly, high-pressure gas in a train pipe can enter th