Self-drainage building module

The utility model relates to a self-drainage building module, and relates to the technical field of transportation. Comprising a plurality of containers, the whole containers are rectangular, and the top walls of the containers are arranged to be corrugated plates longitudinally parallel to the containers. The top wall of the container is a corrugated plate longitudinally parallel to the container. When a plurality of containers are arranged into a building module, the longitudinal sides of the adjacent container side walls abut against each other, at the moment, due to the fact that the top wall of the container body is arranged to be the corrugated plate, water can be discharged from the top wall of the container along the corrugated plate, and the corrugated plate is longitudinally parallel to the container, so that water can flow out from the two ends of the container; the problem that when a building is composed of container modules, water cannot be drained at the original drainage position of the single