High efficiency stimulated Raman scattering (SRS) of BaWO4 crystal was realized by an ultra-cavity single-pass configuration. When the pump source is 532 nm picosecond laser, five Stokes lines (559.64 nm, 590.26 nm, 624.42 nm, 662.76 nm, 706.18 nm) and three anti-Stokes lines (463.42 nm, 484.24 nm, 507.04 nm) are observed. The SRS thresholds and Raman gain coefficients for different scattering lines are measured, and the total conversion efficiency reaches 78%. When the pump source is 355 nm picosecond laser, three Stokes lines (366.52 nm, 379.40 nm, 393.22 nm) are observed, and according to the pump threshold of the first Stokes line the Raman gain is obtained as 51.8±2.7 cm/GW. Experiments have shown that BaWO4 crystal possesses advantages of easy growth, wide transmittance spectrum, high optical damage threshold, and large gain coefficient, which indicates this material will have important applications in generation of whole wave-band visible lasers.