The invention discloses a dung disposal method based on an outdoor circular fermentation bed. The method comprises the following steps: designing a fermentation tank body of the outdoor circular fermentation bed into a cylindrical tank with a discharge hole, arranging a pile-turning machine capable of cyclically moving in the cylindrical tank, moving the pile-turning machine, discharging from the discharge hole, thereby realizing the unmanned operation. Compared with the prior art, the dung disposal method disclosed by the invention is provided with an air blowing system and an air exhaust system, wherein the air blowing system is used for delivering oxygen and promoting aerobic fermentation; and the air exhaust system is used for exhausting odor to realize deodorization and has the effect of assisting air flow, and the air exhaust system operates to suck odor into a special deodorization tank to deodorize in the turning process, so that centralized treatment of the odor is realized. Moreover, the fermentation tank body is covered by a cover, and convenience is further brought to the deodorization treatment.