A low-temperature, green grain-preserving storage apparatus applied in the field of grain storage comprises a draught fan, circular vertical cages, semicircular ground cages, circular baffles and semicircular baffles, the left ends of the semicircular ground cages are connected with the draught fan, the upper parts of the semicircular ground cages are connected with the circular vertical cages, the right ends of the semicircular ground cages are provided with the semicircular baffles, the upper ends of the circular vertical cages are provided with the circular baffles, the circular vertical cages and the semicircular ground cages are provided with a plurality of elliptic holes, and the low-temperature, green grain-preserving storage apparatus is mounted in a large house type granary. In the working principle, the draught fan sends cold wind into the semicircular ground cages, the cold wind then enters the circular vertical cages, and enters each corner in the large house type granary via the elliptic holes on the circular vertical cages and the semicircular ground cages, and thereby the grain in the granary can be stored under uniform low temperature. The ventilating and cooling effect of the apparatus in the large house type granary is good, the grain is stored under low temperature, the temperature is uniform, the preservation time is long, safety is stable, the cost is saved, the weight loss of the grain is reduced, and the deterioration of grain quality is delayed.