The invention discloses an aerodynamic configuration design method for a bi-rotational stable ball based on a fixed wing canard rudder. According to the method, after a rudder area SC, a pitching rudder angle setting value delta Z and the distance XC from a pressure center to a ball mass center of the fixed wing canard rudder are calculated respectively, the maximum value of the lift-to-drag ratio KL/D is solved according to formed constraint conditions; then, a rolling rudder angle setting value delta y and an empennage chamfer angle are determined according to internal and external friction moments of the fixed wing canard rudder and the moment balancing relation between an electromagnetic resistance moment and an aerodynamic moment; and the lift-to-drag ratio KL/D is adjusted under the condition that the rolling rudder angle setting value delta y and the empennage chamfer angle are determined to realize attitude adjustment of a mortar.