A laser rangefinder and a method for implementing the same are provided. When the distance is measured, a number of laser signals are emitted from an emitting unit to an object to be measured. A receiving unit receives the laser signals reflected by the measured object and converts them into an electrical pulse signal. A time measuring unit converts a trigger signal of a laser emitter and the electric pulse signal converted by the laser receiver into a rectangular gate signal. The width of the rectangular gate signal is measured by a pulse counter unit with high precision.