Closed material sorting device and material sorting method

The invention provides a closed material sorting device and method, and the device comprises a stock bin which forms a semi-closed cavity with a feed port; the material blocking assembly is located below the material bin, and under the action of the driving assembly, the material blocking assembly achieves discharging at different positions below the material bin; the sorting hopper is located below the stock bin and connected with the periphery of the semi-closed cavity in the stock bin, and the sorting hopper and the stock bin are communicated or isolated under the action of a material blocking assembly; the sorting channel is located in the sorting hopper, and a discharging opening is formed after the sorting channel extends; and the rotating assembly drives the sorting channel to rotate, so that the discharging openings in the sorting channel rotate to different positions of the periphery of the sorting hopper, and discharging at different positions is achieved. According to the feeding device, material d