The invention discloses a cultivator capable of smashing corn and soybean straw, drilling land and ploughing deeply which solves the problem that the function of prior art is simplex. The cultivator is characterized by including a belt transmission mechanism, a Z-shaped gearbox, a chain transmission mechanism, a front side plate, a rear side plate, a front rotating shaft, a rear rotating shaft and a levelling mechanism; the Z-shaped gearbox is connected to the belt transmission mechanism through a first output shaft, and the belt transmission mechanism is connected to the front rotating shaft which is provided with a smashing knife and connected to the chain transmission mechanism through a second output shaft; the chain transmission mechanism is connected to the rear rotating shaft provided with a land drilling knife; a rear joist is arranged between two connecting plates which are connected to the external of the front side plate and the rear side plate respectively, and a subsoil plough is fixed to the rear joist. The cultivator capable of smashing the corn and soybean straw, which is provided with the two shafts in a cultivator body, has the advantages that the front rotating shaft can smash straw to return to fields so as to reduce pollution; the rear rotating shaft can smash the roots of crops and weeds and turn over soil on the surface; the subsoil plough can eliminate a mirror plane structure caused by compression of rotary tillage; the levelling mechanism can level turnover land; the cultivator can be dismantled and convenient to assemble in different types.