The invention discloses a medium-voltage power failure event analysis method and system. The method comprises the following steps that a terminal reliability module obtains a first power failure information set of a target area through a distribution network automation system; The client omnibearing module obtains a second power failure information set of the target area through a production management information system, a scheduling management system and a marketing management system; And the matching module compares the first power failure information set with the second power failure information set to confirm whether the first power failure information set is matched with the second power failure information set or not, and if not, an abnormal processing work order is generated. By adopting the medium-voltage power failure event analysis method, abnormal situations can be found in time, and after the problems are analyzed and positioned, whether equipment related to a distributionnetwork automation system fails to report or reports mistakenly or whether a production management information system, a dispatching management system and a marketing management system fail to reportor report mistakenly can be known.