The invention relates to a drought-resisting and water-saving irrigation method for a dry-hot valley slope garden, belonging to the technical field of water-saving agriculture irrigation. The method comprises the step of: ditching along the row direction of the fruit trees in the garden, wherein the lengths of the ditches are the same with the lengths of each row of fruit trees, the depth of the ditches is 45-55 cm, the width of the ditches is 30-40cm, the ditches are parallel to the row direction of the fruit trees, the vertical distance between the ditches and the root parts of the trunks of the fruit trees is 50-60cm, membranes are arranged at two ends of the ditches for stopflow, straw bundles or cornstalk bundles are placed in the ditches, and the bundles are arranged 2-3cm higher than the ditch surface; measuring the water content in plough layer soil, wherein water is irrigated in the ditches when the water content of the plough layer soil is less than 30 percent, and water in the ditches permeates into the soil at the fruit tree roots to enable the water content of the plough layer soil to reach 50-60 percent; and laying a layer of straw or cornstalk on the moisture sides of the fruit trees, wherein the laying thickness is 2-5cm. The method has simple structure, simple and convenient operation, low cost, easily-obtained materials and strong adaptability and increases irrigation use ratio by 2.97 times compared with the traditional flooding.