With the rapid development of the green onion industry, the market has a new demand for green onion harvesters: high efficiency, low damage rate and ability to operate in complex terrain planting areas; while the small green onion harvesters on the market in China are not yet mature, and foreign harvesters are not compatible with the ridge planting mode of green onion in China, so they cannot be directly popularized and applied in China. In response to these problems, the team actively responded to the national "14th Five-Year Plan", insisted on self-reliance in agricultural science and technology, and independently developed a lightweight intelligent green onion harvester. The purpose of this design is to solve the problems of low artificial harvest efficiency, complex planting area, low planting depth of green onion and easy damage of green onion during harvest, effectively improve the level of automation and intelligence in green onion harvest, and help the green onion industry to improve quality and efficiency. The harvester is mainly composed of five systems: automatic navigation system, double-stranded dragon combined mining system, triangular crawler travel system, hydraulic power system and remote monitoring system. The automatic navigation system takes the Beidou positioning and navigation technology as the core, and the environment perception technology and control technology as the leading factor, which can make the harvester preset the operation route and avoid obstacles, and realize the automatic navigation and path planning; The double twisted dragon combined excavation system is mainly composed of curved second-order shovel, double twisted dragon, hydraulic cylinder and hydraulic motor, in which the double twisted dragon design time builds a scallion-soil friction model, and optimizes the parameters through simulation experiments, and its unique spiral blade design can break the soil and loosen the soil first, effectively reducing the excavation resistance of the curved second-order shovel; The triangular crawler system has the characteristics of stability and large force area, which solves the problems of poor climbing ability, low stability and easy rolling of green onion plants in the operation of traditional power plant. The distance between the two tracks can be adjusted by the telescopic rod to adapt to different ridge distances; the operating rod can control the movement speed of the harvester and realize differential turning, which makes the operation of the harvester more convenient and flexible. In addition, bumps are added to the crawler to further enhance the traveling stability of the harvester; The hydraulic power system is mainly composed of a hydraulic oil pump, an oil tank, a hydraulic cylinder, a hydraulic motor, and a multi-channel hydraulic control valve. The hydraulic oil pump is powered by a diesel engine to generate high-pressure hydraulic oil, which is transmitted to the hydraulic cylinder and the hydraulic motor through the oil pipe. The valve can adjust the on-off of the oil circuit, and then control the expansion and contraction of the hydraulic cylinder and the rotation of the hydraulic motor; The remote monitoring system mainly includes monitoring background management platform, communication system and airborne terminal. First, the monitoring background management platform provides specific information such as operation and maintenance of scallion harvesters, so as to facilitate technicians to control and allocate the harvesters without time and space constraints. Second, the communication system receives the positioning and status information of the on-board terminal, caches the data in the cloud platform based on Hadoop architecture, and synchronizes the cloud to the mobile phone APP after processing. Finally, the mobile phone APP provides services such as historical route inquiry to help onion households fully understand the real operation conditions of the harvester in the operation.