The utility model discloses a generator rotor magnetic pole turn to turn voltage measurement device, including two magnetic bases and two probe needle assembly, two magnetic base axially movable install at each end of a guide rail and by screw thread stuff for fixation chucking location, installation no. 1 that two probe needle assembly can reciprocate visit needle holder each end and all with a wire electricity federation, visit needle holder and install on the guide rail and can radially be 360 circular rotation around the guide rail, the guide rail passes through the magnetic base and adsorbs on being surveyed motor spindle, probe needle assembly moves down to carried out magnetic pole turn to turn axially movable 0 by the measurement station through the rotation of spy needle holder. The utility model discloses the magnetic pole that can match all kinds of sizes, convenient measuring in succession, avoiding the missed measure data, do not need before the test to clear away with blade or the file winding surface insulation with the measuring point, the length during test does not need the unit of stopping transport for a long time, can reduce the insulating damage of antitrochanter pole winding effectively, improves detection accuracy, especially is fit for using widely in all kinds of electric motor manufacture enterprises.