Oil field well cementation ground manifold gas-driven blowdown device

The utility model relates to an oil field well cementation ground manifold gas-driven blowdown device which comprises a well cementation liquid pumping manifold system and a well cementation liquid medicine supply manifold system, and the gas-driven blowdown device comprises an air compressor, a gas-driven short section, a blowdown short section and a fire hose. Wherein the air compressor is connected with one end of the well cementation liquid pumping manifold system through the air driving short section, the other end of the well cementation liquid pumping manifold system is connected with the fire hose through the pollution discharge short section, and the tail end of the fire hose extends into the dirty liquid storage tank; or the plurality of fire hose belts are connected with the well cementation chemical liquid supply manifold system, the tail end of each fire hose belt is connected with the pollution discharge short section, the other end of the pollution discharge short section is connected with the