Nickel-base superalloy fine-casting blades are difficult to guarantee their machining accuracy during machining due to their large margin and no reference to positioning. In this paper, aero-engine fine-casting blades with nickelbase superalloy are grinded by using robotic belt grinding method combined with adaptive processing technology. Through a 6-point iterative approach, the paper determines the position of the blade relative to the fixture. Then in order to ensure the grinding position and orientation and the grinding parameters, the article plans the trajectory of the model and extracts the position and orientation information of points, and builds fourth order homogeneous matrix to solve the robot trajectory. Finally, based on the information of blade profile, the adaptive processing method was adopted to quantitatively remove the material from the fine-casting blades to ensure its machining accuracy.