The present invention relates to a wiper operation speed adjustment (1) system which enables to regulate operation speed of the wiper (5) according to the movement of the vehicle in rainy weather conditions. The objective of the present invention is to provide a wiper operation speed adjustment system (1) which enables to increase the wiper (5) operation speed at any defined vehicle speed when the wiper speed is not zero and one of right- left turn signals (3) is turned on.