Holographic technology is crucial for realizing a true three-dimensional (3D) display of space suspension. The spatial light modulator (SLM) is currently the only device capable of real-time dynamic holographic true 3D image projection. However, the lack of pixels and resolution limits its application in the field of space suspended true 3D displays. This study examines the real 3D display of space suspension with high resolution and low noise realized using multi-SLM splicing. First, the high resolution hologram with the 360° viewing angle of a 3D object was calculated by Fresnel tomography combined with the spatial coordinate transformation technology. Then, each hologram was divided into four pieces of the image with the same resolution, which were loaded onto four SLMs spliced in an array. After filtering the light beams other than the first order, a complete holographic 3D real image with high information capacity and resolution was reconstructed. Finally, the ultrasonic atomized medium was used for carrying the 3D real image, realizing real-time dynamic space suspension true 3D display. Additionally, this study investigates the noise suppression for the reconstructed image using the time-averaged method, and the experimental results prove that this method can effectively improve the quality of the spatially suspended holographic display image.