To realize the rapid and accurate measurement of a ball nut profile, a laser measurement method is proposed, and a measuring device is designed.First, a device to measure the nut profile is constructed based on the principle of a point laser reflected by a right-angle prism scanning along the axial direction. According to the mathematical model of raceway, a new data processing method of axial normal transformation is proposed. Furthermore, the translation and rotation errors of the right-angle prism, laser offset errors, and inclined laser errors are analyzed and calibrated. Finally, the outline of a standard steel ball and circular groove are measured by the designed frock,and the nut profile ismeasured.After error calibration, the measurement error of the point-laser scanning arc contour is less than 3.1 μm, and the standard deviation is less than 2.2 μm. The scanning image of the nut raceway is complete and useful, which meets the measurement requirements of the nut raceway profile.