The invention discloses a power distribution network distributed power source management method based on a particle swarm optimization algorithm. The method comprises three active management strategies which includes generator output reduction, on-load transformer tapping adjustment and reactive power compensation, wherein the voltage is controlled by limiting the active power output of a distributed power source, the voltage of a power distribution network can be kept within a specified range by adjusting a variable tap on the primary side of a transformer, and the increase of voltage is reduced by adding a reactive power compensation device at an access point of the distributed power source. The purpose of increasing the injection capacity of DG on the premise that voltage constraints are not violated is achieved.