This paper describes an investigation of the SAW beam diffraction on LiNbO3 crystal by the frequency-translated-holographic technique, which allows direct observation of SAW amplitude distributions. The observed diffraction patterns are found to change as a function of excitation frequencies, and to agree well with the theoretical amplitude distributions of the SAW's emitted from the multiple finger pairs of an interdigital transducer. The method of the angular spectrum of plane waves was used for the theoretical computations.