Biological feed fermentation air supply device

The utility model relates to the technical field of biological feed, in particular to a gas supply device for fermentation production of biological feed, which comprises a fermentation tank for fermentation of biological feed. The air supply assembly is fixedly mounted at the upper end of the fermentation tank, and the air supply assembly is used for supplying air to the biological feed in the fermentation tank in the fermentation process; and the filtering assembly is movably installed in the air supply assembly, and the filtering assembly is used for filtering impurities in the air when the air supply assembly supplies air. According to the utility model, external gas is sucked into the fermentation tank through the rotation of the motor and the fan blades in the gas box, and the gas in the fermentation tank is discharged through the air outlet pipe, so that gas can be supplied to the fermentation of biological feed in the fermentation tank, the gas supply effect on the biological feed is kept, and the air