The invention relates to a buried natural gas pipeline earth-surface overflowing drainage cover and an application method, and belongs to the technical field of oil-gas storage and transmission safe operation. A middle air entraining plate is composed by a V-shaped hopper cover, a sleigh-type middle main plate, rotating shaft sleeves, preassembled articulated shafts and assistant tongs; the V-shaped hopper cover is provided with a hollow hopper cavity, a wind-distributing air entraining pipe is arranged at the upper portion of the V-shaped hopper cover in a sleeved mode, and the lower portion of the V-shaped hopper cover is integrally welded with the sleigh-type middle main plate, bent arc-shaped warped parts are arranged at the two ends of the sleigh-type middle main plate respectively, and the middle hole of the sleigh-type middle main plate is matched with the lower end of the V-shaped hopper cover; the rotating shaft sleeves and the preassembled articulated shafts are assembled into 6 sets and are arranged at the two sides of the middle air entraining plate uniformly; the assistant tongs are welded to the middles of the two ends of the middle air entraining plate. According to the buried natural gas pipeline earth-surface overflowing drainage cover and the application method, when the buried natural gas pipeline leaks, harms caused by the overflowing gas generated for the reason that shutdown and depressurization of the pipeline cannot be conducted timely to the surrounding, entering of equipment by rescuers, excavation work and the like are solved through covering a drainage cover device on the earth-surface overflowing area.