Subsoiling device matched with four-wheel tractor

A subsoiling device matched with a four-wheel tractor comprises a supporting large frame as an integral support, and a connecting frame which is arranged on the large frame and is used for connecting with the four-wheel tractor. The large frame is provided with a protective structure. A transmission is mounted on the large frame. The input end of the transmission is connected with a universal coupling of the four-wheel tractor through a spline connecting shaft, and the output end is adjusted by a speed reduction gearbox and is connected with a rotary tillage device. A plurality of rotary tillage bent blades which are at a certain angle to a rotating shaft are arranged between rotary tillage blade rests. The edge of each rotary tillage bent blade extends outward, and an included angle between the edge of the rotary tillage bent blade and an advancing direction is 35-45 DEG. Along with frontward movement of the whole subsoiling device, the subsoiling device can embed grain into ground. The subsoiling device has functions of integrating soil loosening with rotary tillage, effectively settling a problem of straw treatment, and realizing advantages of simple structure and high convenience in use.