The invention discloses a dredging device for agricultural paddy fields, which includes a mounting plate, a rotating column, a three-way sewage discharge pipe, an L-shaped rod, a movable column and a three-way sewage discharge pipe. , it is convenient to pull out the movable column to a certain length by hand, and it is convenient to adjust the height of the rotating column. When the frame is located in hard mud, the rotation of the frame is restricted, and the first magnet and the second magnet in the rotating state The magnetic south pole and magnetic north pole of the magnet are alternately the same and opposite, so the first magnet is subjected to constantly changing attractive and repulsive forces, so that the movable column moves up and down reciprocally, increasing the rotation area, and with the rotation of the L-shaped rod, it can The silt is quickly broken up, and the rotation of the agitating plate further improves the impact effect on the silt, and the silt enters the collection box after passing through the three-way sewage pipe, the sewage pump and the three-way sewage pipe, so the present invention has a good Silt cleaning effect.