Odor self-purification aerobic fermentation device

A feeding port is formed in the upper end of a shell, a fermentation bin a, a fermentation bin b, a fermentation bin c and a fermentation bin d are sequentially arranged in the shell from top to bottom, the fermentation bin a is communicated with the feeding port, a discharging port is formed in the lower end of the shell, an oxygen feeding mechanism and an air exhaust mechanism are arranged on the fermentation bin a and the fermentation bin d, and the air exhaust mechanism is communicated with the discharging port. The gas outlet end of the gas extraction mechanism communicates with the waste gas collection box, and a gas supply mechanism and a liquid supply mechanism are arranged on the waste gas collection box. Aerobic flora is fed into the fermentation bin a through the oxygen feeding mechanism, after a period of time, an electromagnetic valve on the fermentation bin a is opened, waste enters the fermentation bin b for continuous fermentation, finally, the waste is discharged from a discharging port throu