The invention relates to a converter valve fire extinguishing device comprising a side-mounted track frame, fire bottles used for storing fire extinguishing agents, and a control module used for acquiring a fire position; the side-mounted track frame is located in a side-mounted plane vertical to a horizontal plane, and the side-mounted track frame comprises at least two crossover tracks which aremovably provided with movement mechanisms in a guiding way; the movement mechanisms are connected to telescoping mechanisms, and driving mechanisms used for driving the telescoping mechanisms to extend or contract, and the telescoping mechanisms are used for driving fire extinguishing terminals arranged at the ends of the telescoping mechanisms; and the fire extinguishing terminals comprise fireextinguishing nozzles connected to the fire bottles through pipes. In the converter valve fire extinguishing device, according to the corresponding positions of fire points, the fire extinguishing terminals rotatably connected to the telescoping mechanisms are driven by the telescoping mechanisms moving along the set tracks to move to proper positions for extinguishing the fire points, so that thefire extinguishing terminals can reach all positions of different valve towers.