The utility model discloses a traction machine rotor concentricity test device which includes a horizontal testboard and a universal meter. At least two screw holes, which are distributed in a spaced manner in a linear direction, are manufactured in the horizontal testboard, wherein screws, whose upper ends extend out of the horizontal testboard, are tightened and fixed in two adjacent screw holes. The traction machine rotor concentricity test device is capable of effectively measuring the concentricity of a traction machine rotor so that cost is saved significantly compared with a three-coordinate measurement instrument.