Dynamic precipitation control method for foundation pit

The invention provides a dynamic precipitation control method for a foundation pit, which comprises the following steps of: obtaining and analyzing data through water pumping of a test well and a precipitation test, establishing an underground water conceptual model and a numerical model, calibrating water pumping test data by using the underground water numerical model, and finally, simulating and optimizing precipitation design through modeling. The underground water level is controlled within the range capable of meeting the construction requirement according to the thought of step-by-step dewatering and on-demand dewatering in the dewatering process, the dewatering depth and the operation number of dewatering wells are reduced as much as possible, and compared with a large-scale heavy dewatering process, the operation number of the dewatering wells is greatly reduced, economical efficiency is good, and energy conservation and environmental protection are achieved; the method is particularly suitable for l