A grain air-drying apparatus, comprising a hoist and air-drying bins. Each air-drying bin comprises a top charging port and a bottom discharging port. The grain air-drying apparatus comprises a plurality of air-drying towers and a traveling system and a conveyor system above the plurality of air-drying towers. Each air-drying tower comprises a plurality of air-drying bins arranged side by side and having side surfaces connected to form an integer. The charging ports of the air-drying bins are equal in height and are communicated with tower charging ports of the air-drying towers. The plurality of air-drying towers is sequentially and fixedly connected end-to-end and is arranged in a Z shape. The tower charging ports are located below the traveling system. The traveling system comprises a pair of parallel rails and a trolley. Pulleys at the bottom of the trolley are slidably connected to the rails. The conveyor system is disposed between the two rails, and comprises belt pulleys on either end and a conveyer belt provided on the belt pulleys and parallel to the rails. The trolley and an upper belt of the conveyer belt move towards each other to implement shoveling. The hoist is communicated with a feeding funnel on the ground and a charging end of the conveyor system.L'invention concerne un appareil de séchage à l'air de grains, comprenant un palan et des compartiments de séchage à l'air. Chaque compartiment de séchage à l'air comprend un orifice de chargement supérieur et un orifice d'évacuation inférieur. L'appareil de séchage à l'air de grains comprend une pluralité de tours de séchage à l'air et un système de déplacement et un système de transport au-dessus de la pluralité de tours de séchage à l'air. Chaque tour de séchage à l'air comprend une pluralité de compartiments de séchage à l'air agencés côte à côte et ayant des surfaces latérales reliées pour former un ensemble entier. Les orifices de chargement des compartiments de séchage à l'air sont de hauteur égale