To solve the problems of narrow coverage spectrum and difficulty of generation of near-infrared band laser, an experiment al system is developed for multi-wavelength picosecond laser based on stimulated Raman scattering effects. Generation of visible and near-infrared band multi-wavelength picosecond laser is facilitated with methods such as focusing laser beam pump and laser pump energy optimizing and coupling, using 1 kHz repetition frequency and 532 nm wavelength picosecond laser source pump KGd (WO4)2 crystal. The seventh order stokes and sixth order anti-stokes lasers generated cover the spectrum of 415~800 nm with an output Raman laser power of 1.76W. Results of the study can be used in the research and development of new picosecond laser sources.