The invention relates to an electric urgent shutoff valve for a blast furnace system. The valve comprises a butterfly valve; a main shaft supporting seat of one side of the butterfly valve is provided with a transmission supporting seat of which the upper part is assembled with electromagnetic adsorbed iron; the outer side of the transmission supporting seat is provided with a weight balancing device of which the upper part is assembled with an electromagnetic induction disc and a weight balancing sheet; the lower part of the weight balancing device is provided with an axle hole matched with a main shaft of the butterfly valve and is provided with a connecting disc taking the main shaft of the butterfly valve as axle center; the outer side of the weight balancing device connected with the connecting disc is provided with an electric device; the electric device consists of a motor assembled on the upper part and a worm wheel speed reducer; an output worm wheel of the worm wheel speed reducer is connected with a main shaft key of the butterfly valve; the lower part of the transmission supporting seat is provided with a hydraulic buffering device; and the lower part of the weight balancing device corresponding to the position of the hydraulic buffering device is provided with a buffering bump block. Under the normal condition, the electric urgent shutoff valve has the same opening or closing function as the routine shutoff valve; and under the accidental condition, the electric urgent shutoff valve can realize the urgent shutoff of the valve within three seconds which is required by a safety system.