The invention relates to a non-normal state bleeding apparatus for coke oven top portion flue dust capture shield accident bleeding. The non-normal state bleeding apparatus comprises a valve body, a valve flipping plate, a counterweight, a buffer spring and an electromagnetic lock, wherein the valve body is fixed on the top portion of a flue dust capture shield and just above a coke oven rising pipe, the valve flipping plate is hinged to the valve body, the counterweight is fixed on the valve flipping plate through a bracket, the installation position of the counterweight is positioned at the same side as the hinging shaft of the valve flipping plate, the buffer spring is arranged on the side surface of the valve body and just below the counterweight, the counterweight just contacts the buffer spring when the counterweight flips and falls along with the valve flipping plate, the upper end of the valve body is provided with a circle of an outer periphery, and the lower end on the outer periphery of the valve body is provided with the electromagnetic lock. According to the present invention, the non-normal state bleeding apparatus is closed when the coke oven normally produces; and when the coke oven occurs the power failure or sends the interlocking signal, the non-normal state bleeding apparatus can be quickly opened, such that the nixed gas captured in the non-normal state bleeding apparatus can be rapidly discharged into the atmosphere so as to ensure the production safety of the coke oven.