The invention discloses a distribution network line fault section positioning method based on full-waveform information. For the grounding fault, line selection is carried out through extreme value points of a cross-correlation function of the bus zero-sequence voltage and all outgoing line zero-sequence currents, and positioning is carried out according to the adjacent detection point zero-sequence current waveform standard drift rate of the whole action process of a fault occurrence and compensation device; for the interphase fault, line selection is carried out according to the overcurrent information obtained before action of a relay protection device, and positioning is carried out according to the adjacent detection point fault phase current waveform standard drift rate. The waveform data of the whole action process of a fault and arc extinction device are utilized, the current ubiquitous problems that when a small current grounding system encounters the single-phase grounding phase, the fault current is weak, the reliability is poor, and the sensitivity is low can be well solved, and meanwhile the system cannot get interference.