The invention relates to a method of processing a rabbet of a thin-walled tube part for preventing knife winding. The method aims at solving the problem that cuttings winding at a knife tip of a knife tool can be easily formed in the processing process of the rabbet of the thin-walled tube part. According to the method, a main shaft or the knife tool is driven by a variable-frequency and variable-speed motor to rotate, and the feed of the knife tool is driven by a servomotor. A feed mode of the knife tool is changed for preventing the knife winding under the condition that the rotation speed of the main shaft or the knife tool is definite.