The invention discloses a distribution network fault training evaluation method based on a fault isolation information array. The method comprises steps: a fault isolation standard range set (FISR) and a fault isolation practical range set (FIPR) are built to describe standard operation after a single fault and all switch and isolator information in the practical operation isolation range; a fault isolation standard information array (FISI) and a fault isolation practical information array (FIPI) are built to record the standard operation and the number of all action devices for fault isolation after the practical operation, the number of important users in an isolation area, the number of isolation devices in the isolation area, and a fault isolation range set associated with the fault; and through contrast operation between the fault isolation standard information array and the practical fault information array FIPI, a fault isolation evaluation method based on the fault information array is given. The evaluation method can well reflect the fault isolation operation process by a dispatcher, and a good practical training evaluation meaning is realized.