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Spindle need to adjust their straightness by straightening and detecting equipments. By designing an intelligent measurement and straightening device based on DSP master chip technology, a device can be synchronized to complete the straightening and detection. The equipment is equipped with testing station and straightening station, which can be switched each other automatically. The device is equipped with a test station and a straightening station, which can be switched automatically. The device can automatically straighten the spindle according to the test results until its straightness is qualified. Embedded development package with DSP chip as its core enables integrated control of laser sensors, pressure sensors and electrical execution units. The software adopts the CCS3.3 development environment, and solves the key technical problems of automatic closed-loop control by developing the direct pressure self-feedback mechanism and the circular run-up measurement data fitting program. The results of the straightening test show that the device can realize the automatic detection and straightening of the closed-loop workpiece, and the linearity shape tolerance is less than 0.05mm, which greatly improves the straightness of the spindle.