A solid grain sterilizing device comprises a sterilizing gas source (1). The solid grain sterilizing device further comprises a conveying pipeline. A gas supply apparatus (3) and a feeding apparatus (5) are disposed at the upstream of the conveying pipeline, and a discharging apparatus (12) is disposed at the downstream of the conveying pipeline. The feeding apparatus (5) is provided with a first gas inlet (6) and a second solid grain inlet (7). An outlet (2) of the sterilizing gas source is connected to an inlet (4) of the gas supply apparatus. The gas supply apparatus (3) is connected to the first gas inlet (6) of the feeding apparatus (5). An outlet (8) of the feeding apparatus is connected to the conveying pipeline. The discharging apparatus (12) is provided with a gas outlet and a material outlet (13). The material outlet (13) of the discharging apparatus (12) and the second solid grain inlet (7) of the feeding apparatus (5) form a loop, so as to form a material circulation loop. An unloading apparatus (19) is disposed in the circulation loop. Due to the adoption of the pneumatic conveying apparatus, grains can be suspended in sterilization gas and is sterilized in the apparatus. The device is applicable to material treatment on grains of different granularities, and is especially applicable to treatment on superfine grains. The device can provide an industrial production sterilization process.La présente invention concerne un dispositif de stérilisation de grains solides qui comprend une source de gaz stérilisant (1). Le dispositif de stérilisation de grains solides comprend en outre une conduite dacheminement. Un appareil dapprovisionnement en gaz (3) et un appareil damenée (5) sont disposés en amont de la conduite dacheminement, et un appareil de décharge (12) est disposé en aval de la conduite dacheminement. Lappareil damenée (5) est doté dun premier orifice dentrée de gaz (6) et dun second orifice dentrée de grains solides (7). Un orifice de sortie (2) de
