Testing device for detecting smoothness of shaft

The embodiment of the utility model discloses a testing device for detecting the smoothness of a shaft, and the testing device comprises an elastic module which is provided with an upper detection point and a lower detection point, and the upper detection point and the lower detection point are respectively in contact with the upper surface and the lower surface of the shaft to be detected; the adjusting module is mechanically connected with the elastic module and is used for adjusting the position of the shaft to be detected in the vertical direction through the elastic module; the conversion module is electrically connected with the adjusting module and used for receiving the position change transmitted by the adjusting module into a corresponding numerical value and converting the numerical value into a corresponding angle value; the to-be-detected shaft and the center of the conversion module are on the same horizontal plane; and the controller is electrically connected with the conversion module and is u