A high-resolution and wide-spectral Raman spectrometer based on a Czerny-Turner (C-T) optical configuration with a rotating grating was designed to address the trade-off between resolution and spectral coverage in grating spectrometers. The excitation wavelength was set at 532 nm, with a spectral range of 80～3000 $ {\mathrm{c}\mathrm{m}}^{-1} $ with a resolution of 1.2 $ {\mathrm{c}\mathrm{m}}^{-1} $ The spectral range was divided into three bands: low (80～1450 $ {\mathrm{c}\mathrm{m}}^{-1} $), medium (855～2225 $ {\mathrm{c}\mathrm{m}}^{-1} $), and high (1630～3000 $ {\mathrm{c}\mathrm{m}}^{-1} $). Optimization was primarily focused on the medium band, while considering the entire frequency band. By fine-tuning the rotation angle of the grating, the low, medium, and high bands were all located on the effective image plane of the CCD detector. The point spread function, root-mean-square (RMS) wavefront error, and modulation transfer function (MTF) of the imaging system all met the design requirements.