Due to the limitation of the number of pixel,the wide band and high resolution are difficult to meet at the same time.Raman spectrometer with wide band and high resolution is designed for 532nm excitation wavelength.The whole spectral range is divided into four bands according to the limiting resolution requirement of first band,and the integrated design of switching between different bands is completed by using rotating grating and rotating focusing mirror,and the spectral range of Raman spectrometer is 80~4000cm-1 and the resolution is 1.2cm-1.Taking into account the large size of the detector,in order to avoid interference of the components,the components in the system have enough distance between them.Compared with similar products in the market,the spectrometer has a wide band and high resolution without replacing other components inside the structure,which saves the cost to a certain extent.