A construction site drainage method using a water collecting well is characterized by comprising the following steps that 1, a drainage steel-pipe (5) pipeline is set; 2, the water collecting well is built; 3, a protection net cover of the water collecting well is prepared; 4, a drainage steel-pipe (5) pipeline trench is dug; 5, the drainage steel-pipe (5) pipeline and the water collecting well are embedded and installed; 6, the protection net cover of the water collecting well is installed; 7, dismantling is conducted for reuse, wherein according to the need of an engineering site, and after the construction project is finished, both the drainage pipeline and the water collecting well can be dug out for recycling and be reused in the next construction project. The construction site drainage method using the water collecting well has the advantages that the water collecting well is simple in structure and convenient to built, by means of a complete drainage method, the on-site drainage problems can be effectively solved, smooth drainage is ensured, unnecessary slag removal and dredging work of drainage ditches is reduced, labor is saved, the construction period is shortened, recycling can be achieved, and the cost of the project is reduced.