To provide an underground water control method for basement construction for not lowering a underground water level in the vicinity of an excavated site while treating the surplus soil of the excavated ground as dry surplus soil in constructing a basement.

Underground water is controlled in basement construction by a cut-off part construction process for constructing cut-off parts 11, 12 annularly in a predetermined underground range to intercept the lateral infiltration movement of underground water in ground excavation, and a spring water discharge process for excavating a drain hole 41 with an area smaller than the predetermined range surrounded by the cut-off parts 11, 12, and pumping out underground water springing out and standing in the hole 41, to discharge the water into a ditch 52 formed between the cut-off parts 11, 12 and a bank 51 constructed along the cut-off parts 11, 12 around the cut-off parts 11, 12.