A pre-labeling method for the reconstructed image position of a diffuse reflector in the reconstructed plane is proposed. Firstly, a hologram is obtained by using the specular reflected light of a specific area on the object as object light, and the area where the +1 ^st-order reconstruction image is located is pre-marked. Then, without changing the position of the object, the object light emitted by the diffuse reflector on the object is holographically recorded, and weak diffuse reflection is extracted from the original pre-marked area. By changing the inclination of illumination light and combining FIMG4FFT method, the three-dimensional contour of the object at a specific viewing angle is obtained. After obtaining the three-dimensional contours at multiple viewing angles, the problem of solving non-linear equations is transformed into an optimization problem by using particle swarm optimization (PSO) to solve the stitching parameters, so as to achieve the final stitching of the three-dimensional object contours at multiple viewing angles in cylindrical coordinates. The error calibration experiment shows that the maximum relative measurement error is 5.6%. The proposed method can successfully acquire and stitch the threaded surface with multi-view and three-dimensional contours, and realize the three-dimensional holographic display of rotary parts.