Abstract: In order to avoid cutting edge on the handle of subsoiler and reducing its strength, the soil breaking edge is separated from the shovel handle for independent design, and a special arc-shaped soil pre-ripper with inner arc radius of 150 mm is formed to cut the soil and reduce the resistance of subsoiling operation. In this paper, the effect of soil pre-ripper on drag reduction is verified by field test, and the best installation position of the pre-ripper on subsoiler is determined. The experimental results show that, when the amplitude is 5 mm, the vibration frequency is 10 Hz, the forward speed is 1.44 km/h, and the tillage depth is about 500 mm, the tillage resistance of the combined subsoiling shovel with pre-ripper can be reduced by 12.46%～ 22.87%, with an average reduction of 18.48%, and the drag reduction effect is obvious. The best installation position of the soil pre-ripper is determined according to the subsoiling depth, under the condition of subsoiling depth in this paper, the drag reduction effect of position No.3 is the best. This study provides a theoretical basis for the development of subsoiling machines and equipment with simple structure and high drag reduction efficiency.