The invention belongs to the field of seed processing, and particularly discloses a seed storage device. The device comprises a drying chamber and a storage chamber which is fixed on one side of the drying chamber; an inclined screen is slidably connected in the drying chamber; the through hole is positioned above the screen, and a pressure valve is arranged in the through hole; a motor is fixed below the screen in the drying chamber, and an output shaft of the motor penetrates through the side walls of the drying chamber and the storage chamber and extends into the storage chamber; a cam is fixed on an output shaft of the motor and located below the screen, a guide block is fixedly connected to the lower end of the screen, and the guide block is slidably connected to the outer wall of thecam; a threaded section is arranged at the part, located in the storage chamber, of the output shaft of the motor, and a sliding plate is connected to the threaded section in a threaded mode; and thesliding plate is transversely and slidably connected to the inner wall of the storage chamber, a limiting switch used for closing the motor is arranged on the inner wall of one side, away from the drying chamber, of the storage chamber. By the adoption of the scheme, the problem that the existing storage tank is single in function is solved.