Dual-wavelength solid laser pumped NdYAG in miser configuration combined with the iodine absorption frequency stabilization technology and the external cavity-enhanced second harmonic generation technology is constructed to develop 266 nm ultraviolet (UV) laser wavelength standard device. The iodine absorption frequency stabilizing system read by a single dual-wavelength solid-state laser of 532 nm can give a reference frequency. When the output frequency of the 532 nm laser departs from the reference frequency, the cavity length of this laser will be controlled by a feedback signal from the iodine absorption frequency stabilizing system through a servo control system, so that the output frequency of the 532 nm can be locked to the reference frequency provided by the frequency stabilizing system. Because the laser at 532 nm is obtained from the frequency-doubled 1064 nm laser through PPKTP frequency doubling crystal, the frequency stability of the laser at 1064 nm can be assured. The single dual-wavelength solid-state laser of 1064 nm can provide a frequency stable UV laser output at 266 nm through double frequency doubling process.