The invention discloses a method for enlarging a holographic reproduction image viewing area. The CGH in the method is obtained through superposing all interferograms, wherein information of one object point is recorded in one interferogram. The horizontal dimension of the interferogram is equal with summation of a recorded object and an SLM, and the vertical dimension is equal with that of the SLM. In a reproduction process, three linearly arranged SLMs are used for loading a CGH, and boundaries generated by all the interferograms on the CGH are parallel with one another. The method according to the invention has advantages of reducing a requirement of a reproducing system to a viewing distance, reducing viewing area wastage information and enlarging the reproduction image viewing area and the viewing angle.