Water-collecting, water-saving and fertilizer-saving irrigation method

The invention provides a water-collecting, water-saving and fertilizer-saving irrigation method which comprises the following steps: respectively digging water collecting ditches on two sides of each fruit tree in a thin-planting orchard, arranging a passage for fruit farmers to work between the two water collecting ditches, and filling a plurality of water storage infiltrating irrigation devices in soil below the bottoms of the water collecting ditches, the water storage infiltrating irrigation device is used for collecting rainwater gathered in the water collecting ditch and infiltrating the collected rainwater into the soil area where the root system of the fruit tree is located; soil with fertilizer is filled among the plurality of water storage infiltrating irrigation devices, so that the rainwater utilization rate is increased, and the water saving effect is achieved. According to the invention, a fruit farmer can directly make water and fertilizer directly reach the roots of fruit trees during irrigati