The utility model belongs to a novel pressure release valve plate stabilizing device for a tank circuit breaker. The novel pressure release valve plate stabilizing device is mainly composed of a valve seat and a valve plate, 1-10 pressure release valve springs are arranged between the valve plate and the valve seat, snapping grooves for the pressure release valve springs to be snapped in are arranged on the surface of the valve seat, the surface of the valve seat corresponds to the valve plate, one ends of the pressure release valve springs are located in the snapping grooves, and the other ends of the pressure release valve springs abut against the valve plate. According to the novel pressure release valve plate stabilizing device, a pressure release valve plate and the valve plate can be tightly attached by means of spring forces when the device is opened to guarantee pressure in a gas chamber, and the valve plate can be jacked by gases when the device is closed so that fresh air can enter the gas chamber, the opening and the closing are more stable, and safe operation of the novel pressure release valve plate stabilizing device is guaranteed.