The invention discloses a device for separating velvet flying fibers from feather dust in the technical field of velvet flying fiber separation. The device comprises a dust removal box and a separation box. The dust removal box and the separation box are connected by a flow guiding pipe, and two ends of the flow guiding pipe communicate with the inner chambers of the dust removal box and the separation box. The middle portion of the left side wall of the dust removal box is screwed with an air inlet, the left side of the air inlet is connected to an air outlet of a fan through a flange, the left side of the bottom of the dust removal box is equipped with a power motor through a motor seat, and the purity of the separation is improved through dust removal processing before the separation. Through the mode of the automatic operation of dust removal and separation, the work efficiency and the work quality are improved. Through the inclined setting of a secondary sieve plate, the movementspace of a raw material in the separation box is increased, and the separation is more thorough. The movement range of the raw material in the dust box is increased by the setting of a spoiler, so that the flow time of the raw material in the dust box is increased, and the dust removal effect is effectively improved.