The invention discloses a method for reducing ring-barking intensity for winter jujube trees by means of root trimming and rhizosphere nutrition regulation and control. The method comprises following steps: (1) root trimming: before sprout of winter jujube trees, vertically cutting off the roots at the distance that is 3 to 5 times of the diameter at breast height from the trunks at two sides of winter jujube trees, trenching in the same direction, trenching to the outer edge of the projection of crowns at two ends; (2) rhizosphere nutrition regulation and control: performing nutrition regulation and control on the winter jujube tree roots after root pruning, applying winter jujube bio-fertilizer in the trenches during root pruning, filling the soil back and compacting and watering after fertilizing; (3) slightly girdling: in the full flowering stage of the winter jujube trees, performing ring-barking, wherein the width of ring-barking is twentieth to tenth of the trunk diameter. Through the root trimming and rhizosphere nutrition regulation and control, the ring-barking intensity for winter jujube trees is finally reduced so as to reduce the harm on winter jujube trees and increase the fruit setting rate of winter jujube.