The invention discloses a rudder pushing mechanism, and belongs to the field of steering engines. The rudder pushing mechanism includes two spaced double-rod double-acting hydraulic cylinders arrangedin parallel, a first shift fork and a second shift fork; through the arrangement of the double-rod double-acting hydraulic cylinders, push rods are arranged on all piston rods of the double-rod double-acting hydraulic cylinders respectively, two clamping grooves in the first shift fork are in contact with the push rods of the two piston rods at the ends of the two double-rod double-acting hydraulic cylinders respectively, two clamping grooves in the second shift fork are in contact with the push rods of the two piston rods at the other ends of the two double-rod double-acting hydraulic cylinders respectively so that the double-rod double-acting hydraulic cylinders can be controlled to extend or retract to drive the first shift fork and the second shift fork to rotate synchronously, and therefore rubber rods of two rudders are driven to synchronously rotate; the rudder pushing mechanism is simple in structure, and the problem is avoided that due to the arrangement of two rudder pushingmechanisms and a synchronization mechanism, the occupied space is large, and the maintenance is inconvenient.