The invention discloses a power distribution network fault recovery method based on conversion power supply affinity; the method comprises the steps of analyzing a conversion power supply path betweena load node and each contact switch when the power grid operates normally, calculating the electrical length of the path, the operation reliability and the residual capacity, and determining the conversion power supply affinity of each contact switch to the load node based on a TOPSIS sorting method by taking all the factors into consideration; and after the power grid breaks down, a power supplyrecovery scheme is quickly generated according to a conversion power supply affinity sequencing result. According to the method disclosed by the invention, the states of the power distribution network before and after the fault are generated by utilizing the conversion power supply affinity invariance, and the generation speed of the power supply recovery strategy after the fault is improved by means of the operation analysis of the conversion power supply affinity before the fault, so that the phenomenon that the loads of the power distribution network are unbalanced after the fault is recovered is effectively avoided.