The invention discloses a method for eliminating span center direct flashover by utilizing early discharge, which belongs to the technical field of flashover elimination. The method adopts a lightninginformation source induction device to identify gradient changes of a lightning pilot electric field, and precisely positions a lightning stroke point before the lightning flashover occurs. After anignition coil is activated, an air gap channel generates a large number of free electrons in advance, an insulation matching ratio at the moment is far smaller than 1, and the insulation matching protection range is expanded to a full span range from the vicinity of tower insulators. Short circuit is formed at the tower insulators on the two sides by means of early discharge arcs, three-phase leadwires are grounded and then separated from grounding through arc extinguishing, the state that the three-phase lead wires are intensively alternated with ground short circuit and ground open circuitis formed, meanwhile, power frequency short circuit is restrained through arc extinguishing, and the dual purposes that lightning stroke potential is clamped and short circuit tripping is avoided during early discharge are achieved.