The utility model relates to a special single-row deep groove ball bearing for a guide wheel of an automobile door. The special single-row deep groove ball bearing comprises an outer ring, an inner ring, rolling bodies and a connecting mandrel, wherein a seal ring is fixed on the outer ring; and external circle plastic is arranged on the outer ring. The special single-row deep groove ball bearing is characterized by also comprising a retainer, wherein the inner ring is an integral inner ring; the rolling bodies are spherical rolling bodies which are uniformly distributed between the outer ring and the inner ring; the inner ring is installed and fixed through the connecting mandrel; and the spherical rolling bodies are uniformly spaced by the retainer. According to the special single-row deep groove ball bearing for the guide wheel of the automobile door, the original two separable inner rings are converted into one integral inner ring, and meanwhile, the ball bearing is changed from the original full balls without the retainer to full balls with the retainer. Therefore, the bearing can bear the corresponding load, the rotation resistance is reduced, and the bearing is less prone to abrasion in case of high-load application. When the bearing is arranged on the automobile door, the resistance is smaller than the original resistance during movement of the door, and the service life of the bearing is longer than that of the original bearing; and due to satisfactory matching, vibration or noise is avoided when an automobile runs at a high speed.