The invention discloses a pulse laser ranging high-low threshold value leading-edge discriminator circuit and a discrimination method of the pulse laser ranging high-low threshold value leading-edge discriminator circuit. The pulse laser ranging high-low threshold value leading-edge discriminator circuit comprises two comparators AD8611, an active delay line DS1100, a first trigger and a second trigger. TTL output serves as output of the comparators AD8611 used by the pulse laser ranging high-low threshold value leading-edge discriminator circuit, the propagation delay is 4 nanoseconds, and the rise time of an output waveform is 3 nanoseconds. Meanwhile, due to the fact that the two high-speed D triggers are used for carrying out shaping and shake removal on the output of the comparators AD8611, a high-quality signal can be obtained to carry out time measurement. Meanwhile, due to the facts that the active delay line DS1100 is further used, and the active delay line DS1100 is small in packaging size and high in accuracy, the task of adjusting the time sequence can be accomplished on the situation that accuracy and the size of a system are ensured. According to the pulse laser ranging high-low threshold value leading-edge discriminator circuit, the existing leading-edge discrimination technology is improved, and the pulse laser ranging high-low threshold value leading-edge discriminator circuit has the advantages of being high in accuracy and simple in structure, is a circuit which is high in ranging accuracy, and is applicable to a laser ranging circuit, wherein a pulse rising edge of a pulse laser in the laser ranging circuit is dozens of nanoseconds.