The utility model discloses a feather pre -separation device, including box, fan, curved surface separation net, group work or material rest, the string bag, two inboards of bottom half all be equipped with the curved surface separation net, curved surface separation net below all is equipped with the fan that the inclined that inclines put, and it has the apron to put to articulate at bottom half central point, the slope of a box lateral wall upwards communicates with each other and connects the unloading pipe, just the box top is the circular cone type, sets up the discharge gate in the top central point department of putting, the discharging pipe of semicircle loop type is connected to the discharge gate, cup joints the string bag below the discharging pipe, the inside rotation of box is equipped with group work or material rest, the bottom half is equipped with the stabilizer blade that is used for the support. The utility model relates to a feather pre -separation device, has easy operation, the good advantage of separation efficiency.