Abstract: In order to design the vine cutting device of peanut combine harvester reasonably, on the basis of determining the rotation sawing as the vine cutting mode, the motion characteristics of the apex and root points of the teeth of the saw disk cutter are analyzed, and the key parameters of the saw disk, such as tooth height, tooth number and tooth pitch are determined. Through the analysis of the force on the cutter edge of the seedling, it is found that the proper inclination of the cutter edge can reduce the resistance of the cutter edge. The geometric model of peanut vine was established and the orthogonal experiment of three factors and three levels of cutting simulation was carried out with the help of ANSYS_LS DYNA. The minimum cutting force of peanut vine was 50 N when the disc thickness was 5 mm, the blade angle was 20° and the tooth height was 17 mm. The relative error between the experimental value and the simulation value is 3.24%, which shows that the finite element simulation method is feasible to measure the cutting force of peanut vine. The results can provide the basis for the design and parameter optimization of peanut vine and vine cutting device.