The invention provides a jet-adjustable windscreen wiper control method and system. The method includes the following steps that 1, according to the environmental resistance condition of jetting of awindscreen wiper, the target jet pressure is calculated; 2, under the vehicle static and wind-free conditions, the basic jet volume required by every half wiping period is determined, and according tothe basic jet volume and the jet stage, the target jet volume required by every half wiping period is determined, wherein the step 1 and the step 2 can be exchanged; 3, according to the target jet pressure and the target jet volume, the main jet time corresponding to each half wiping period is calculated; 4, according to the target jet pressure, the target jet volume and the main jet time, the jet work of the windscreen wiper is controlled. According to the jet-adjustable windscreen wiper control method and system, the adjustability of the jet work is achieved, and resources are easily saved.