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The current precision belt grinding precision detection technology has low detection accuracy and poor detection efficiency. In order to solve the above problems, a new precision grinding belt grinding precision detection technology was studied with reference to the engine robot. The accuracy data was collected, and the collected system data was used as the basic information source to obtain the point cloud information of the blade parts. The main coordinate system of the working robot is processed, and the accurate information of the blade robot is obtained by 3D laser scanning. At the same time, the polishing operation is performed, and the PCA algorithm is used to analyze, further simplify the data set, and select the appropriate algorithm processing position according to the main distribution law of the data. Scope, in the three-dimensional space, the points are matched to the points in the coordinate axes respectively, and the contour of the grinding contact surface and the surface integrity of the grinding are analyzed to realize the precision of the grinding precision of the engine blade robot . The experimental results show that compared with the traditional detection technology, the detection precision of the precision grinding belt grinding precision detection technology of engine blade robot is improved by 31.28%, and the detection error is reduced by 15.21%.