The invention provides a wiper blade control method and system of an automobile windscreen wiper. A cutting edge of a wiper blade can change over a first posture and a second posture along with changeof the moving direction of the wiper blade. The method includes the steps: determining that the cutting edge stopping posture of the current wiper blade is the first posture or the second posture according to stored historical data, and enabling the total time and/or total times of the cutting edge stopping at the first posture and the second posture to be the same; controlling the wiper blade tomove to a stopping position at the first posture and stopping the wiper blade at the first posture if the cutting edge stops at the first posture, controlling the wiper blade to move to the stoppingposition at the first posture and then move reversely by a preset distance if the cutting edge stops at the second posture, changing the cutting edge of the wiper blade and stopping the cutting edge at the second posture; updating and storing current data into the historical data after determining the cutting edge stopping posture of the current wiper blade. According to the wiper blade control method and system of the automobile windscreen wiper, permanent deformation caused by single stopping posture of the wiper blade is eliminated, and the service life of the wiper blade is prolonged.