Abstract: The geometric assembly model of multi-axis CNC abrasive belt grinder is preprocessed, the auxiliary coordinate system and the initial position of the machine tool motion axis are defined, the machine tool workbench group and tool group are analyzed, and the motion (translation and rotation) of each motion axis are sequentially connected to get the kinematic chain of the grinder. The coordinate transformation matrix is derived based on the kinematic chain of the machine tool, the post-processing algorithm of the grinder is obtained, the post-processing coordinate transformation function is constructed, and the development of the post-processor is realized based on MATLAB. Finally, taking the wide-chord hollow fan blade as the verification object, the correctness of the post-processing algorithm is verified by VERICUT virtual simulation environment and real machine environment.