The invention discloses an automatic wort preparation device. The automatic wort preparation device comprises a base and is characterized in that a tank is fixedly connected to the top of the base, and a top plate is fixedly connected to the top of the tank. The automatic wort preparation device has the advantages that the device is provided with a first motor, a second motor, a second bearing, alimit plate, a connecting plate and a sealing mechanism which are coordinated, and the first motor drives the connecting plate to move upwardly to be fixed with the limit plate to allow the second motor to drive a stirring rod to rotate and drive the inner ring of the second bearing to rotate so as to achieve height adjusting and stirring; by the coordination of the sealing mechanism and a discharge pipe, the bottom of a movable tank can be sealed when discharge is not performed, the problems that the drying and stirring of an existing wort preparation device are usually separated, malt is inevitably contaminated by dust during carrying, and the cost is high are solved, and the automatic wort preparation device integrating drying and stirring is low in preparation cost and worthy of popularization.