Accurate measurement technology of laser detection sensitivity is mainly introduced. The accurate measurement of laser detection sensitivity is realized by some advanced technologies such as the homogenization shaping technology of laser beam and the number control (NC) adjustment technology of laser attenuation. Verified by relative experiments, the range of output power density of laser detection sensitivity testing is 0.32×10-6~1.43 W/mm2, the uncertainty changing range is 2.0 %~9.1% and dynamic range is 66 dB.