The invention discloses a large down cluster separating device. The device comprises a first box, a third box and a control box, the bottom of the side of the first box is communicated with a down inlet tube, a strip screen mesh is arranged under the first box, a debris recovery chamber is disposed under the strip screen mesh, the inside of the first box is sequentially provided with a main shaft,a second shaft, a third shaft and a fourth shaft from bottom to top, a second box is disposed between the first box and the third box, the first box and the second box are separated by a partition plate, the tops of the first box and the second box are communicated, the second box and the third box are separated by a second partition plate, and the bottoms of the second box and the third box arecommunicated. The device has the advantages that the device achieves the automatic and streamlined production of the large down cluster separating operation, reduces the dependence on artificial labors, improves the efficiency of the large down cluster separating, can remove debris as the large down cluster separating, improves the quality of a down cluster, and reduces the need for down cluster debris removal in the later stage.