The invention provides a large-scale holographic display method based on effective utilization of two spatial light modulators. The method comprises the following three steps: first, information of anobject is firstly divided into two equal parts, the two parts are respectively extracted into two information groups, namely, an information group 1 and an information group 2, and effective visual areas of reconstructed images of the two information groups are respectively analyzed; second, central fringe patterns of the two information groups are respectively calculated based on the effective visual area analysis, and holograms of the two information groups are respectively generated through translation and superposition, the position of the reconstructed images is adjusted by using a blazed grating in order to realize seamless splicing of the reconstructed images, phase information of the bladed grating is combined with the holograms of the two information groups through superpositionso as to generate two final holograms; and third, the final holograms of the two information groups are respectively loaded to two SLMs, and the large-scale reconstructed image can be reproduced by aspatial multiplexing method.