A highly stable all-solid state ultraviolet laser with a center wavelength of 355 nm pumped by a laser diode (LD) with a center wavelength of 915 nm is demonstrated. LD with a central wavelength of 915 nm and linewidth of 5.3 nm is used as a pump source to end-pump Nd∶YVO₄ crystal, and two LBO crystals are used as frequency doubling crystal and frequency tripling crystal in the laser. A stable all-solid state ultraviolet laser with a center wavelength of 355 nm is obtained by using V-shaped plane-convex unstable resonator structure and acousto-optic Q-switching mode. When the repetition rate is 30 kHz and the pump power is 45 W, the output power of the ultraviolet laser is 3.7 W, the pulse width is about 13 ns, optical-to-optical efficiency is 8.2%, the beam quality factor M² is less than 1.2, and the output power stability (peak-to-peak value) is less than 4.5% in 6 hours of running time.