Abstract: Under the corn soybean strip compound planting mode, the corn belt on both sides needs to be harvested in turn, and the operation process is cumbersome. In this paper, a high gap corn harvester which can harvest corn belts on both sides at one time is designed, and the whole machine and key components are designed. In order to verify the reliability of the frame, the finite element simulation of the frame is carried out by using ANSYS Workbench software. It is found that the maximum value of the first six modal frequencies of the frame is 41.55 Hz, which is less than the excitation frequency value of the vehicle in the working state, which meets the safety requirements of the design. In order to verify the operation performance of the prototype, taking the loss rate as the index, the field test was carried out under the condition of operating speed of 3 km/h. The results showed that the total loss rate S_Z= 18.88% of the prototype of high gap corn harvester could realize the harvest operation of riding across the soybean belt on both sides of the corn belt under this agronomic mode, and simplify the operation process of corn harvest. This paper can provide design reference for the research of corn harvester under this agronomic mode.