The utility model provides a sinusoidal wave generating device, include: first frequency divider, input clock signal carries out a plurality of fractional frequency signals of output behind the frequency division of different proportions, this a plurality of fractional frequency signals are inputed to the multiple selector, and according to one of them target frequency division signal output of first control word selection, this target fractional frequency signal is imported to the second frequency divider, and regards as the frequency division coefficient to produce address clock signal with the second control word, sinusoidal wave quantification amplitude value is stored to the memory, and the address counter, import this address clock signal, and produce address signal under this address clock signal's control, follow the sinusoidal wave quantification amplitude value of this memory index and the production sine wave.