A steel ball adjustment arm reversing device comprises a fixed piece and a movable piece, both the fixed piece and the movable piece are provided with central shaft holes, and the fixed piece and the movable piece are installed together through compression nuts in the manner that a connection threaded rod penetrates through the central shaft hole of the fixed piece and the central shaft hole of the movable piece; holes in even number are formed in the radial end face surrounding the center shaft hole of the fixed piece in a circular shape at equal degrees; two holes are vertically formed in the radial end face surrounding the center shaft hole of the movable piece in the diameter direction penetrating through the center shaft hole; steel balls are arranged in the two holes of the movable piece, the two holes of the movable piece align with any pair of holes passing a straight line of centers of circle of the central shaft hole, so the steel balls can be located in the holes of the fixed piece and the movable piece at the same time; the fixed piece is connected with a fixed rod, and the movable piece is connected with a movable rod. The steel ball adjustment arm reversing device is convenient to operate, simple in structure and easy to manufacture, and can be widely applied to industrial and agricultural machines.