Heat exchanger of aerobic fermentation tank

The utility model relates to the technical field of fermentation tanks, in particular to a heat exchanger of an aerobic fermentation tank, which is mounted on a tank body and comprises an air inlet pipe, a main pipe and an air outlet device, the air inlet pipe and the air outlet device are communicated with two ends of the main pipe and are respectively communicated with the outer side of the tank body, and the air inlet pipe is communicated with the main pipe. The main pipe is provided with a first connector and a second connector. In order to ensure the temperature of materials in the tank body, the heat exchanger is used for preheating gas entering the tank body by the residual heat of the gas exhausted from the tank body under the condition of not increasing heat energy for heating, so that the damage of energy sources is greatly reduced, the balance of the temperature of the tank body is also ensured, and the service life of the tank body is prolonged. According to the design, the effects of recovering h