The utility model provides a EMUs traction motor turns to judgement system, the system includes angular transducer, microcontroller and host computer, angular transducer is used for gathering the inclination of EMUs traction motor's shaft coupling, microcontroller with angular transducer connects for sample according to preset frequency angular transducer obtains the inclination forms inclination sampling information, and will the inclination sampling information transfer give the host computer, the host computer is received it sampling information in inclination is carried out the analysis and is obtained turning to of EMUs traction motor. The utility model discloses can fast, accurately realize differentiating of motor rotation, shorten and pull motor rotation and judge test duration, improve and pull motor rotation and differentiate the degree of accuracy, realize that EMUs pull automatic detection the that motor rotation judges.