The invention discloses a power distribution network reliability evaluation method considering complex transfer supply and belongs to the power system reliability analysis technical field. The method includes the following steps that: the transferrable supply probability of each equivalence node in a system and the physical failure rate of each equivalence node itself are calculated, and the unreliability of each equivalence node in the system can be obtained based on the transferrable supply probability and the physical failure rate; equivalent fault nodes in the system are listed, and influenced users are divided into two kinds of nodes according to fault positions; and an index reflecting the reliability of a power distribution network can be obtained based on the first two steps. The power distribution network reliability evaluation method is based on probability and a simplified power distribution network topological graph. According to the method of the invention, the influence of complex transfer supply constraints in the power distribution network is considered, and whether the equivalence nodes can realize transfer supply is considered as an uncertain event. The power distribution network reliability evaluation method considering complex transfer supply is suitable for evaluating the reliability of power distribution networks under actual conditions.