The invention discloses an arch breaking bin, comprising an outer separation barrel; a feed port is arranged in the sidewall of the outer separation barrel, a condiment is fed from the feed port into the outer separation barrel, gas subjected to gas-solid separation is discharged from a gas outlet, and the condiment is dropped into the outer separation barrel and discharged from a discharge port. The arch breaking bin is characterized in that the outer separation barrel is also provided with a pulse valve, the pulse valve can provide a pulse flow, an arch breaking tube is also arranged between the pulse valve and a discharge port passage and is provided with pores, and part of the pulse flow passes through the arch breaking tube and is scattered via the pores to break an arch of the condiment during discharging. The invention also discloses a discharge unit comprising the arch breaking bin. The arch breaking bin is simple in structure, can effectively eliminate arching and bridging due to dampening and crystallization of the condiment, allows smooth discharging, and provides improved discharging stability.