The utility model relates to the field of gas pipelines, in particular to a gas gate valve for preventing the blocking. The utility model for solving the technical problem provides the easy-to-dredge gas gate valve for preventing the blocking. According to the gas gate valve, the blocking can be avoided. The technical scheme provided by the utility model is that the gas gate valve for preventing the blocking comprises a gate valve chamber and a cleaning hole, wherein the cleaning hole is formed in the wall surface of the gate valve chamber; a blocking device is arranged on the cleaning hole; and a blow-down valve is arranged at the bottom of the gate valve chamber. By additionally arranging the cleaning hole in the wall surface of the gate valve chamber, when the gas gate valve is blocked by accumulated ash or tar and other substances, high-pressure water or steam can be imported from the outside by the blocking device, the blocked gate valve chamber can be cleaned through the cleaning hole to remove the blocked substances, thus recovering the closing function of the gas gate valve. The gas gate valve disclosed by the utility model can be applied to the field of pipeline delivery with a gas system as the representative and requirement on effective prevention of the blockage of gate valves by materials.