The invention provides a crop seed drying device. The drying device includes a drying case; the upper end of the drying case is provided with a feeding inlet, and the lower end of the drying case is provided with a discharging port; discharging port is provided with a sealing cover; the lower end of the drying case is provided with supports; one end of the drying case is provided with a motor; therotating shaft of the motor is connected to a stirring shaft; the stirring shaft passes through the drying case; the other end of the drying case is provided with a heating case; the heating case isprovided with a heating wire and connected to the air outlet of a fan through a pipeline; the stirring shaft is distributed with stirring rods; one ends of the stirring rods are connected to stirringpaddles; the stirring shaft and the stirring rods are all hollow structures and communicate with each other; the stirring shaft and the stirring rods are provided with air vents; the end, away from the motor, of the stirring shaft is connected to the heating case through a bearing; the inner cavity of the stirring shaft communicates with the heating case; and the upper end of the drying case is provided with a moisture exhausting port. The drying device can uniformly dry crop seeds, and is high in drying efficiency and uniform in drying.