The invention provides a method for accurately guiding a sublevel return stage of a carrier rocket based on ballistic forming, and belongs to the technical field of guidance and control. The method ischaracterized in that a virtual inertial sight angular velocity model which uses a grid rudder as an actuator and is composed of the rocket-loaded navigation output sublevel state and before-shootingbinding target information is designed, the optimal guidance expression of ballistic forming under a ballistic system is derived, and then real-time flight overload commands of the sublevel return stage are obtained. The method can effectively improve the sublevel dropping area and sublevel reusing return guidance precision, and effectively ensures high-precision landing of a sublevel at a target landing point with the desired dropping angle by fully utilizing the high control efficiency of the grid rudder in the large dynamic pressure area.