The invention discloses a grain storage drying device for agriculture. The grain storage drying device comprises a bottom plate, a storage tube, a mounting plate, a lantern ring, a stirring shaft, anair inlet pipe, an air heater, a stirring rod, a first bevel gear, a second bevel gear and a third bevel gear. The grain storage drying device is provided with a motor, the stirring shaft, the stirring rod, the first bevel gear, the second bevel gear and the third bevel gear, the motor drives the stirring shaft to rotate, and the stirring shaft drives the stirring rod and the first bevel gear to rotate. Grain in the storage tube is stirred through the stirring rod to avoid the situations that the grain is stacked, consequently the humidity of the grain is increased, and storage is difficult. Meanwhile, the first bevel gear drives the third bevel gear to rotate through the second bevel gear, the third bevel gear drives the storage tube to rotate, and the rotating direction of the storage tube is opposite to that of the stirring shaft. A supporting rod and an electric push rod are arranged, and a telescopic rod of the electric push rod is controlled to stretch to enable the mounting plate and the storage tube above the mounting plate to incline, so that the grain in the storage tube is discharged.