The subsoiling combined soil preparation machine is mainly used for subsoiling soil tillage, breaking the bottom layer, breaking the surface layer, deepening the tillage layer, improving the structure of the tillage layer, improving the soil water storage and moisture retention, and the ability to resist drought and waterlogging. farming. Deep loosening increases the pores in the deep soil, and the proportion of the three phases (solid, liquid, and gas) is properly adjusted, which has the functions of increasing temperature, preventing cold and slowing down soil erosion and wind erosion. The soils that were once barren and not suitable for deep ploughing, such as saline-alkali soil, white mud soil, loess, etc. Combined with fertilization, subsoiling can break up the surface layer, level the ground, and improve the soil.