Fermentation device of gamma-polyglutamic acid

The utility model relates to the technical field of fermentation equipment, and discloses a gamma-polyglutamic acid fermentation device which comprises a fermentation tank, a stirring rod arranged in the fermentation tank, a stirring paddle and a defoaming paddle arranged on the axial surface of the stirring rod, a coupling box arranged on the top surface of the fermentation tank, a motor arranged on one side of the coupling box, and a first bevel gear and a second bevel gear arranged in the coupling box, the outer surface of the fermentation tank is fixedly connected with a defoaming agent pipe, one end of the defoaming agent pipe is connected with a booster pump, one end of the booster pump is provided with an electromagnetic valve, and one end of the electromagnetic valve is connected with a defoaming agent box. The oxygen pump is installed, the one-way valve is opened, the oxygen pump is started to convey oxygen into the oxygen conveying pipe, then the oxygen enters the flow dividing pipe, the flow dividi