The utility model relates to the field of turbomachinery detection, and particularly relates to a compressor rotor detection apparatus. The compressor rotor detection apparatus includes an X-direction driving mechanism, a Y-direction driving mechanism, a rotation driving mechanism, a support mechanism, a workbench, and a displacement detection sensor, wherein the X-direction driving mechanism and the support mechanism are arranged on the workbench, the Y-direction driving mechanism is arranged on the X-direction mobile slide table of the X-direction driving mechanism, the displacement detection sensor for detection is arranged on the Y-direction mobile slide table of the Y-direction driving mechanism, the X-direction driving mechanism and the Y-direction driving mechanism enable the displacement detection sensor to have an X-direction moving degree of freedom and a Y-direction moving degree of freedom, the rotation driving mechanism is arranged on the workbench and is coaxially connected with one end of a compressor rotor after the compressor rotor is well clamped, the X-direction driving mechanism and the Y-direction driving mechanism are provided with grating rulers, and the tail of the servo motor of the rotation driving mechanism is provided with a rotary encoder. The compressor rotor detection apparatus can comprehensively analyze the detection result based on technological requirements and has high detection accuracy.