The invention discloses a seed cotton foreign fiber separator which comprises a separating chamber consisting of an electrode plate set and a case body, a feeding port, a discharge port, an impurity discharge port, a fan and a wind chamber. The electrode plate set consists of an anode plate and a cathode plate. The electrode plate of the electrode plate set, which is positioned between the separating chamber and the wind chamber, is a wind-evening network-shaped structure. The seed cotton foreign fiber separator is characterized in that a stirring device is arranged between the anode plate and the cathode plate in the separating chamber, and at least one stirring and shifting roller constitutes a stirring and shifting roller set. Compared with the prior art, the seed cotton foreign fiber separator can effectively clear foreign fibers such as mulching films, and the like during cotton picking, and meanwhile can clear other impurities, and the clearing effect is good.