Abstract: Reasonable fertilization is an important part of ensuring fruit yield and quality in orchard planting. Analyzing the research status of orchard automatic fertilization machinery, the automation, versatility, and integration degree of orchard fertilization in mountainous areas is low, which cannot meet the requirements of fertilization operation of small and medium-sized orchards in hilly mountainous areas. Design an orchard automatic fertilizer applicator that integrates ditching, fertilization, soil covering, and compaction. The overall structure and plan design are introduced, and the functions and working principles of each main structure are explained. The ditching width is 200 mm, and the ditching depth is adjustable within the range of 0～400 mm. The symmetrical double auger is used for forced fertilization. The amount of fertilization can be adjusted to achieve quantitative and fixed-point fertilization,improve the efficiency of orchard fertilization, and effectively improve orchard planting. The lack of labor in the middle of the year reduces the production and management costs of the orchard.