Abstract: Abstract: Green onion has widely been one of the most important cash crops in recent years. Its planting area is ever-increasing year by year. However, the mechanized harvest level is less than 20% in China, which seriously restricts the green onion industry. In this research, a combined shovel-screen device was designed for green onion digging, shaking, and soil tillage, in order to significantly improve the reliability and working efficiency during harvesting. Three parts were mainly composed of the digging shovel, the shaking screen, and the soil tillage mechanism. A mechanical model was also constructed to theoretically clarify the working principle and design idea. Then, the discrete element simulation was conducted for the green onion ridge in the harvest period. A field test was also carried out to verify the performance of the developed device and the original one. The simulation results showed that the soil disturbance and the flow condition of soil particles were better in the combined shovel-screen device than before. The field test results showed that the average impurity and damage rates of green onion were 2.94%, and 1.66%, respectively, while the soil accumulation was less than 10%. Furthermore, the green onion ridge soil was almost free from accumulation and blocking, when the combined shovel-screen device was digging, shaking, and soil tillage in the test. Correspondingly, there were decreases of 0.51 percentage points, 0.77 percentage points, and 40 percentage points in the average impurity and damage rates of green onion, as well as the soil accumulation in the test, respectively, compared with the original. The finding can also provide a strong reference for the research on the technology and equipment of digging, shaking, and soil tillage during harvesting, further promoting the rapid development of the onion industry.