A light detection and ranging (LiDAR) device and an operating method thereof include irradiating a laser light toward an object; outputting a laser reflection light signal by detecting the laser light reflected from the object; measuring a pulse width corresponding to a period in which the laser reflection light signal is saturated from the laser reflection light signal and changing at least one of a laser light intensity to be irradiated by the laser light irradiator or a gain of an amplifier according to the analyzed pulse width; and controlling the laser light irradiator to irradiate an adjusted laser light corresponding to the changing.