The invention discloses a pulse optimization method used for increasing ranging accuracy of cable faults and a pulse generating circuit. During cable fault range detection by the pulse time domain reflection method, to-be-analyzed pulse is just the fault point reflecting pulse actually rather than emission pulse, so a circuit can be designed to generate an emission pulse voltage waves which is connected to two ends of original edge of a pulse transformer. One of the emission pulses is normally injected into a cable, and the other counteracts the emission pulse injected into the cable before an AD of the auxiliary edge of the pulse transformer is collected. Thus, signals acquired by the AD only include reflection pulse of fault points without emission pulse. The waveforms are simple, clear and easy to analyze without effects on normal injection of the emission pulse signals into a fault cable. An insulation pulse transformer is used for inputting signals, so pulse reflecting signals on the cable can be acquired; interference can be inhibited; and reliability is high.