Provided is a circular stock bin, wherein a bottom portion of a stock bin body (1) is provided with a discharging and bin-clearing device; the discharging and bin-clearing device comprises a central rotary mechanism (2), a main drive mechanism (3), a scraper discharge mechanism (4), a girder mechanism (10) and a revolution travelling mechanism (9). The central rotary mechanism (2) comprises a rotary barrel body (2a) coaxial with the stock bin body (1), and a bottom portion of the rotary barrel body (2a) is provided with a rotary bottom plate (2c). The scraper discharge mechanism (4) comprises a head shaft (5) and a tail shaft (6); the head shaft (5) is mounted at a head portion of the girder mechanism (10) and is driven by the main drive mechanism (3); the tail shaft (6) is mounted at a tail portion of the girder mechanism (10); a chain (7) is wrapped between a driving sprocket (5a) on the head shaft (5) and a driven sprocket (6a) on the tail shaft (6); and scrapers (8) are uniformly arranged on the chain (7). The revolution travelling mechanism (9) is located in an annular space under a stock bin conical surface (1a); the tail portion of the girder mechanism (10) is supported by the revolution travelling mechanism (9); the head portion of the girder mechanism (10) is inserted into the rotary barrel body (2a); and the head portion of the girder mechanism (10) is provided with a scraper mechanism discharge port (10d) penetrating the rotary bottom plate (2c). The circular stock bin can be used as a rice dreg bin or an unprocessed grain bin, and has a low energy consumption.