The utility model discloses an earth surface overflow drainage cover for a buried natural gas pipeline, and belongs to the technical field of oil-gas storage and transportation as well as safe operation. A middle gas guide spliced plate consists of a V-shaped funnel cover, a sled type middle main plate, rotating shaft sleeves, pre-assembled hinge shafts and auxiliary tongs; the V-shaped funnel cover is provided with a hollow funnel cavity; the upper part of the V-shaped funnel cover is sleeved with an air distribution and gas guide pipe; the lower part of the V-shaped funnel cover is integrally welded with the sled type middle main plate; two ends of the sled type middle main plate are provided with curled arc warpings; a hole in the middle part of the sled type middle main plate is matched with the lower end of the V-shaped funnel cover; the rotating shaft sleeves and the pre-assembled hinge shafts are combined to form six sets which are uniformly arranged on two sides of the middle gas guide spliced plate; the auxiliary tongs are welded to the middle parts of two ends of the middle gas guide spliced plate. When the buried natural gas pipeline leaks gas, the drainage cover device is arranged at an earth surface overflow position in time, so that damage, caused by overflowing gas due to a fact that the conventional pipeline cannot stop transportation and reduce the pressure in time, to the surrounding environment, entering of rescue personnel and rescue equipment, digging work and the like is avoided.