The invention relates to a power distribution network risk assessment method in typhoon disasters based on space-time grid association, and belongs to the technical field of power distribution networks. The method comprises the following steps: firstly, carrying out space-time grid division processing on an area where the power distribution network is located; Integrating multi-source informationof the power distribution network under the typhoon disaster, including power distribution network tower equipment information, typhoon meteorological information, topographic information and underlying surface information; Secondly, performing space-time association processing according to the divided grids and the disaster information of the power distribution network; Furthermore, risk grids are screened out according to the wind speed information, and a power distribution network disaster evaluation index system is established.