Datum deviation compensation type processing system for box body or shell part

The utility model relates to a datum deviation compensation type processing system for a box body or a shell part. A main positioning datum and a transition datum are formed on the box body or the shell part, wherein the processing system comprises numerical control processing equipment (5) and a detection device (4) for detecting actually measured distance values of a transition datum zero point (WZP1) in a machine coordinate system of the numerical control processing equipment in the X-axis, Y-axis and Z-axis directions relative to a main positioning datum zero point (WZP2); and a detection signal can be transmitted to a numerical control unit of the numerical control processing equipment (5) by the detection device (4). According to the utility model, by compensating the actual deviation between the transition datum and the main positioning datum, an error of datum noncoincidence generated due to the nonuniform datums in the machining process of the box body or the shell part is eliminated, so that the pro