The invention belongs to the technical field of agricultural mechanical equipment, and particularly discloses a soil improvement device. The soil improvement device comprises a box body, and also comprises connecting units, first driving units, a second driving unit, a mixing unit, a taking unit, a first plate, a second plate, a third plate, a fourth plate and an air storage chamber. On one hand,through mutual cooperation of the connecting units, the first driving units, the second driving unit, the mixing unit and the taking unit, stirring plates clockwise and anticlockwise rotate, an improvement agent and soil are fully and evenly mixed through the stirring plates, the soil is refined, oxygen is fully absorbed, the oxygen content of the soil is guaranteed, and therefore the improvementeffect on the soil is improved; on the other hand, through cooperation of fixing columns, fixing rods and rotating rollers, jolting force of the improvement device in the running process is relieved,occurrence of rollover of the improvement device is avoided, and therefore the stability of the improvement device is improved.