The utility model discloses a filler bin which comprises a barrel body, a connecting piece and a conical bucket. Particularly, the barrel body is formed by rolling a strap-shaped board body in a spiral mode; the connecting piece is fixed at the lower end of the barrel body; and the upper end of the conical bucket is connected with the connecting piece. According to the filler bin, the barrel body has good cylindricity, sizes of different positions of the barrel body can be controlled well, structural strength and sealing performance of the barrel body can be improved greatly, production efficiency of the barrel body is improved, production cost of the barrel body is reduced, and stability of the conical bucket is also improved at the same time. Moreover, the utility model further discloses a mixing plant provided with the filler bin.