Stimulated Raman scattering is an important frequency conversion method for obtaining novel wavelength laser. For an intracavity Raman laser, the fundamental light and multi-Stokes light simultaneously resonating in the laser cavity provide the possibility for outputting multi-wavelength visible laser by second-order nonlinear optical frequency conversion, which can meet the application needs for multiple wavelength laser in some fields, such as laser medical treatment, laser display, spectral imaging, and biophotonics. Vanadate crystal is an important solid Raman gain medium driven by Nd-ion laser for its excellent stimulated Raman scattering properties. In this paper, the Raman spectral characteristics of vanadate crystals and the research status of related Raman laser are briefly introduced. Then, the research progress of second harmonic and sum-frequency generation of Raman laser in recent years is summarized, and the development and application prospects of techiques for generating multiple wavelength-switchable visible laser by Raman selective frequency mixing are briefly analyzed.