The invention provides a power distribution reliability pre-control method based on distribution network topology, which comprises the following steps of: 1, accurately defining an outage range in a distribution network topology structure in the process of making an outage plan; 2, analyzing a single outage range and determining outage users and the number of outage households; 3, comprehensively analyzing a specified group of outage plan, and determining a repeated outage range therein; and 4, assisting a plan maker in combining the outage plans to reduce the repeated outage. The method has the advantages of accurate statistics and integral analysis, the loss of the outage households can be reduced and the power distribution reliability can be improved.