Spindle revolution error measuring device capable of separating mounting eccentricity

The utility model discloses a spindle revolution error measuring device capable of separating mounting eccentricity. The spindle revolution error measuring device includes a displacement sensor mounting clamp, a displacement sensor, a grating encoder, a signal cable, a data processor and a computer. The displacement sensor is installed in the middle part of the displacement sensor mounting clamp. The displacement sensor mounting clamp is installed on one side adjacent to the outer periphery of a spindle. The grating encoder is installed on the other side adjacent to the outer periphery of the spindle. The grating encoder and the displacement sensor are connected with the data processor through the signal cable. The data processor is connected with the computer. According to the utility model, roundness errors of a spindle profile and eccentricity errors of the mounting of a standard ball and the sensor are separated from spindle revolution motion errors on one hand, so that the separation operation load is small. On the other hand, only one displacement sensor is adopted, so that measurement errors due to sensor performance difference of three sensors adopted in a common three-point error separation technique are avoided. Therefore, the spindle revolution error measuring device has a value of promotion and application.