The invention discloses a soil dispersion mechanism on a paddy field soil turning and soil preparing integrated machine, and belongs to the technical field of rice farming machinery. The soil dispersion mechanism comprises a surrounding cover, a tillage cutter and a dispersion shaft, the surrounding cover is fixed onto a frame, the tillage cutter is fixed into the surrounding cover, parts of tillage cutter extends out of the front end of the surrounding cover, a plurality of dispersion cutter heads are fixedly arranged at the front end of the dispersion shaft and positioned in the surroundingcover, openings are formed in the lower end, the front end and the rear end of the surrounding cover, the width of the surrounding cover is larger than that of the tillage cutter, the a threaded sleeve is fixedly arranged on the dispersion shaft, a fixed connecting rod, a movable connecting rod, a swinging arm and a second connecting plate are hinged in an end-to-end manner to form a connecting rod mechanism, an input shaft is connected at the rear end of the dispersion shaft through a universal joint, and the input shaft is connected with a power source. The soil dispersion mechanism has theadvantages of high soil preparing efficiency and the like.