A rudder control assembly used in a boat comprises a control unit having a left control plate and a right control plate; a control unit having a left connecting unit and a right connecting unit; a front end of the control unit being connected to the left control plate and the right control plate; a rudder unit installed at a tail end of the boat; the rudder unit including a right shaft; a rudder body; a left extension plate, a right extension plate, a driving plate and a rudder; The right shaft is connected to the boat body and rotatable axially. A lower end of the right shaft is connected to the driving plate. The driving plate is connected to the left connecting unit and the right connecting unit. The left connecting unit and the right connecting unit are hard rods.