The invention provides a method for acquiring the influence situation of a disaster on a power distribution network. According to the technical scheme of the invention, each disaster of the power distribution network is subjected to situation grading, and then a quantitative index is determined. According to the analytic hierarchy process, the influence sub-situation of each disaster is synthesized, and then the power supply situation rating of the power distribution network and the comprehensive evaluation score of an optimization scheme are determined. According to the power supply situation rating of the power distribution network and the comprehensive evaluation score of the optimization scheme, the influence situation result of the disaster is obtained based on a grey correlation method. The method is strong in adaptability, and the quantitative description of the influence situation of each of various equipments can be accurately and effectively realized. The perceiving, reasoning and analyzing on the operation situation under the influences of disaster conditions can be reliably realized. The operation change of the power distribution network can be analyzed and reasoned, while the influence of the disaster can be comprehensively and quantitatively considered. As a result, the method provides an accurate, comprehensive and reliable data basis for the disaster defense and treatment of the power distribution network. Meanwhile, the disaster prevention and treatment efficiency of the power distribution network is improved. The safety and the operation reliability of the power distribution network are improved.