Abstract: A windshield wiper spoiler essentially comprised of a plate spoiler connected with a folded plate to the wiper blade; rectangular openings respectively formed in the center and on both sides between the spoiler and the blade; plate protrusions being respectively provided to the rectangular openings on both sides; both ends of the spoiler being inwardly folded to each from a slightly erected flap; the surface of the spoiler indicating inclined folding; two shuttle shape ventilation holes being provided in symmetric on both sides to allow the wind force to escape upward without expanding to outer sides as limited by both flaps, thus to increase the compressing force to facilitate the operation of the windshield wiper.