Basement waterproof and drainage combined construction method

The basement waterproof and drainage combined construction method comprises the following specific steps that basement drainage ditch construction is conducted according to a design drawing design path, and the drainage ditch is poured through impervious concrete; in the pouring process of the drainage ditch, an edge pressing structural body is installed above the drainage ditch in an embedded mode, and the structural body is a high-hardness steel body; and a cover is laid above the drainage ditch, so that the drainage ditch forms a sealed ditch structure. The basement drainage ditch is suitable for basement construction design, the drainage ditch structure is adopted, the adjusting piece can be controlled to enable the first water passing through groove to be communicated for drainage when a basement needs drainage, and on the contrary, when drainage is not needed or water in the drainage ditch body needs to be prevented from flowing back to the basement, the adjusting piece can be controlled to enable the f