Unloading device of raw material system

The utility model relates to a blanking device of a raw material system, which comprises a material storage box, a material returning pipe vertically communicated with the upper end of the material storage box and a material discharging pipe vertically communicated with the lower end of the material storage box, the lower end of the material discharging pipe is communicated with a material inlet of a vertical mill, and the upper end of the material storage box is provided with a material storage box inlet matched with a material outlet of a crusher. The upper end of the material returning pipe is provided with a material returning outlet matched with a material inlet of the crusher; the rotating shaft vertically penetrates through the material returning pipe and the discharging pipe, the rotating shaft is sleeved with the rotating sleeve, a material returning spiral blade located in the material returning pipe is fixedly connected to the rotating sleeve, and a discharging spiral blade located in the dischargi