Abstract: Compared with femtosecond laser pulses in the near-infrared region, femtosecond pulses in the ultraviolet region have the advantages of high single-photon energy, good focusing property, high ionization rate and low filament threshold value.It has broad application prospects in the production of high power density optical field and the field of plasma photophysics.Femtosecond pulses in the ultraviolet region have become a hot spot of laser technology.With the development of ultraviolet femtosecond laser technology, the traditional pulse width measurement method cannot meet the demand.The main advances in the study on pulse width measurement of ultraviolet femtosecond lasers are pointed out.The measurement methods currently available for ultraviolet (UV) femtosecond laser pulse width are discussed, mainly including two-photon fluorescence measurement, cross-correlation method, degenerate four-wave mixing method, multiphoton ionization method.The relevant easurement principles and characteristics are introduced.Based on the research, the research prospects of the ultraviolet femtosecond laser pulse width measurement technology are prospected.