The invention discloses a trunk type fruit tree one-side leaning technology, wherein main branches lean towards one side, are straight and grow obliquely, and tree bodies take the shape of fishbone-shaped fans and are uniform. During protected cultivation, after fruit trees are planted in spring, main trunks of entire fruit trees are inclined to keep an include angle being 35-45 degrees with the ground in July in the current year, and during open field cultivation, the main trunks of the fruit trees are inclined to keep an included angle being 65-75 degrees with the ground in the first year. When the fruit trees are planted in south-north rows, the main trunks of the fruit trees are adjusted to incline towards the west, and when the fruit trees are planted in east-west rows, the main trunks of the fruit trees are adjusted to incline towards the south to form a one-side leaning shape. After the fruit plants are planted, one main branch is preserved for each fruit tree and the fruit tree adopts single main-branch type management, the main branches are pruned and formed into the one-side leaning shape; during protected cultivation, the planting distance is 0.8-1m and the row spacing is 1.8-2m; and during open field cultivation, the planting distance is 1-1.3m and the row spacing is 2.5m. The trunk type fruit tree one-side leaning technology disclosed by the invention has the characteristics of high speed in putting into production, high yield, good quality, simpleness for management, less investment, market orientation, gale resistance, long life and attractiveness for sightseeing.