The shape of digital media images is often irregular, which increases the difficulty of collecting small details and leads to a decrease in the quality of their 3D reconstruction. Therefore, a 3D reconstruction method for digital media images based on laser holographic projection is proposed. Using CCD cameras and laser equipment to collect digital media images, the phase and amplitude of each point on the object light are obtained based on laser holographic projection and diffraction theory, and a laser holographic projection image containing small information is obtained. In view of the speckle noise generated in the projection process, the compound wave plate and Frosted glass are used to modulate the phase of the object light, suppress the coherence of the light source, and remove the noise on the image. The bounding box algorithm is used to obtain the three-dimensional spatial coordinates of the light entering the object, and the Euler Lagrange equation is used to establish a three-dimensional reconstruction data field for the image, achieving the three-dimensional reconstruction of digital media images. The experimental results show that the proposed method can effectively remove noise during the reconstruction process, ensure the clarity of the reconstructed image, reduce the error of 3D reconstruction of digital media images, and shorten the reconstruction time. The maximum reconstruction mean square error of the proposed method does not exceed 0.5, and the reconstruction time is within 10 seconds.