A method on controllable reconstruction of Fresnel computer-generated hologram watermark for digital hologram has been proposed. Complex amplitude distribution is obtained by calculating discrete Fresnel transformation of the watermark object wave in the holographic plane, and the watermark and the diffraction distribution signal are double-random-phase modulated to improve security. The encryption data are reprocessed and modulated to get real-coded CGH watermark. The encoded signal after the discrete cosine transformation is added to medium frequency component with certain intensity. The watermark can be blind extracted without the host hologram signal. The results show that the approach behaves good invisibility and is robust to many attacks such as cropping, JPEG compression, filtering, rotation, scaling, etc. The method has good digital reconstruction quality for both the host hologram and the watermark. The size and position of the watermark can be easily adjusted by changing the magnification and the reconstructed wave. The zero-order image elimination of the host hologram does not affect the extraction of the watermark.