The invention discloses a blocking reverse turn-on method based on voltage abrupt change amount and three-sequence component asymmetry. In voltage-time-type feeder automation, the downstream automation switch of a fault point is blocked and turned on reversely according to the sequence component asymmetry, and an interconnection automatic switch blocks the interconnection transfer according to thesudden change amount of the voltage positive sequence component. The method adapts to asymmetric faults and symmetrical faults, provides a new reverse locking turn-on strategy, and improves the reverse locking turn-on sensitivity, thereby improving the accuracy of positioning and isolation of the local feeder automation fault section.