Abstract: Aiming at the lack of mulberry leaf harvesting machinery in hilly and mountainous areas, the difficulty of mulberry leaf harvesting and collection, and the labor intensity of manual harvesting, developing a mulberry leaf harvesting machine for hilly and mountainous terrains. and mountainous areas, and focused on the design and test of the transfer device. Firstly, analyze the working environment of the mulberry leaf harvester and the mulberry leaf harvesting process, and complete the analysis of the working principle and structural design and calculation of the receiving mechanism, guiding mechanism and bag feeding mechanism of the transfer device. Secondly, according to the design parameters, the prototype of mulberry leaf harvester is made, and the test of the transfer device is carried out in the hilly and mountainous mulberry gardens. Finally, according to the test to get the conclusion: mulberry leaf harvester transfer device toggle speed for 80 r/min, automatic decoupling length size b₁=25 mm, width size b₂=25 mm, depth size b₃=15 mm, when hook thickness h₃=8 mm, the receiving mechanism transfer process mulberry leaves average transfer rate of 95.78%, the guide mechanism mulberry leaves into the bag of the average rate of 97.88%, the bag feeding mechanism bag drop rate of 1.25%, the success rate of automatic bag removal is 98.75%. The field test in mulberry orchard shows that the mulberry leaf harvester transfer device can meet the functional requirements of mulberry leaf harvesting, which verifies the correctness and feasibility of the design.