Regional-scale rainstorm waterlogging analysis method and device and storage medium

The invention discloses a regional-scale rainstorm waterlogging analysis method and device and a storage medium, and belongs to the technical field of flood control and disaster reduction. The method comprises the following steps: firstly, dividing a region into a first-stage row region and a second-stage sub-row region; using a conceptual lumped model to simulate and analyze rainstorm runoff of each secondary sub-drainage area in the area; then simulating an outflow process at a second-stage gate station based on a runoff production process of a second-stage sub-discharge area; generalizing a river channel, a regulation and storage lake, an outer discharge gate station, a regulation and control water gate and an inner cylinder, and obtaining the water level and the flow of each section of the river network and the residual water amount in each secondary sub-discharge area through river network regulation and storage calculation; then, the waterlogging water quantity in each secondary sub-drainage area is dis