The invention provides a method and a system for positioning a lightning strike fault point of a distribution line. The method comprises the steps of determining the power off range of a distribution network faulted line according to the action information of a wire outgoing switch of a transformer substation and an automatic switch on an upper column of a distribution line; starting a lightning positioning system search engine to search ground lightning and cloud lightning positioning information along the distribution line according to the power off range of the distribution line, so as to determine each positioning point, lightning current width I, lightning type, linear distance to the distribution line and heat of the distribution line relative to the ground; calculating a sequence of fault points leading to tripping of the distribution line according to each positioning point, lightning current width I, lightning type, linear distance to the distribution line and heat of the distribution line relative to the ground; pushing the fault point sequence to a fault point positioning receiving terminal corresponding to related area. According to the technology, the method has the advantages that the lightning strike fault point of the distribution line can be quickly positioned, thus accurate information can be provided to quickly recover the power supply of the distribution line, and the power supply reliability of the distribution line can be improved.