The invention relates to a single-flashboard cracking gas valve coke discharging assembly and a coke discharging method. According to the single-flashboard cracking gas valve coke discharging assembly, a plurality of upper connecting pipes are welded in parallel on a cracking gas valve body bottom plate connecting member in a welding manner; an upper connecting flange is welded to one end of the upper connecting pipe, and is used for connecting a corresponding ball valve; the lower portions of the ball valves are connected to a plurality of parallel lower connecting pipes in a flange connecting manner; and the parallel lower connecting pipes are connected to a coke powder collecting pipe in a welding manner. According to the present invention, the operation is simple; and the coke discharging assembly is cleaned before and after every cracking gas valve action, the coke powder entering the cavity body of the cracking gas valve falls into the coke powder collecting pipe in the coke discharging assembly along with the anti-coking steam, and is fixed in the coke powder collecting pipe grid, the external coke discharging assembly adopts a plurality of short pipes connected in parallelso as to ensure the smoothness of the anti-coking steam of the cracking gas valve, and by adjusting the anti-coking steam, the positive pressure chamber pressure capable of being visually checked is formed in the cavity body of the cracking gas valve, such that the leakage of the circulating medium in the cracking gas total pipe into the large valve cavity body can be avoided.