A digital coding and decoding method on recoding Fresnel diffraction distribution of multiple threedimensional (3D) objects in the same hologram is discussed. Firstly, fast Fourier transform algorithm is used to calculate the complex amplitude distribution of the three- dimensional objects in the holographic plane, and then the object wave data are preprocessed to avoid digital spectrum aliasing, and finally different carrier frequency coefficients are controlled to produce interference hologram. The method of digital reconstruction is based on extracting effective spectral components in the digital spectrum hologram and then calculating discrete Fresnel inverse transform to rebuild the original three- dimensional objects. The simulation results show that the proposed method can record multiple three- dimensional objects with different production parameters at the same time and has good reproduction quality. The hologram production parameters such as wavelength, reproduction distance, carrier frequency coefficients can also serve as a key to realize encryption storage for multiple three-dimensional objects.