The utility model relates to an automatic heterochrosis eiderdown removing devices, including the transfer unit branch, send the fine hair part, the image acquisition part, the computer processing part, subtotal collecting part rejects, transfer unit divides the drum motor who mainly takes the level of doing to move by white conveyer belt and drive and transmission to constitute, traffic directionalong the conveyer belt, it send the fine hair part to be equipped with in proper order in the top of conveyer belt, the part is rejected to the image acquisition subtotal, image acquisition part andthe partial transmission that realizes information through the computer processing part of rejection, tail end at white drive belt traffic direction is collecting part, the image acquisition part mainly comprises with the light source linear array scanning camera, reject the part mainly by collecting the empty van, the blow vent, the suction fan, solenoid valve and suction nozzle are constituteed. The utility model discloses under guaranteeing yield's the condition, can reject the heterochrosis eiderdown in the white eiderdown accurately to guarantee that the white fine hair of rejecting thein -process false retrieval is less than a ration.