The invention discloses an airflow cotton conveying device. The device comprises a cotton conveying pipe, a cotton conveying pipe inlet and a cotton conveying pipe outlet which are formed at two ends of the cotton conveying pipe, a fan, a dust cage which is arranged in the cotton conveying pipe and a leather bladed beater, wherein the leather bladed beater is arranged below the dust cage; and the fan is arranged in front of the cotton conveying pipe inlet. The invention solves the problem that: in the prior art, cotton flow passes through a cotton conveying device and then is still required to pass through a cotton condenser so as to remove impurities, such as dust, flocks and the like, in cotton, so that the processes are more complicated, and the long-distance conveying of the cotton is unfavorable; the dust cage is arranged in the cotton conveying pipe, and the fan is used for producing negative pressure in the dust cage, so that the impurities such as the dust, the flocks and the like pass through small holes in the surface of the dust cage and enter the dust cage, and the cotton conveying pipe removes the impurities when conveying the cotton; and the device has a simple structure, is low in cost and high in transmission speed, and is applicable to long-distance conveying.