The invention discloses a sudden-surging-prevention water pressure control method used for underground engineering. The sudden-surging-prevention water pressure control method is characterized by including the following steps that a casing pipe with a switch valve is vertically arranged on a foundation bottom plate and fixed, a water discharge hole penetrating the foundation bottom plate to a soil body below is constructed in the casing pipe, and the switch valve is switched off; and a lower port of the casing pipe is connected with the water discharge hole, and an upper port of the casing pipe is connected with a water pressure control pipeline. The sudden-surging-prevention water pressure control method has the beneficial effects that by forming the hole in the casing pipe with the switch valve, sudden surging of underground water is prevented from happening after the foundation bottom plate is drilled through; and by discharging water and reducing pressure through the water pressure control pipeline, the size of an underground water head below the foundation bottom plate can be effectively controlled, and it is ensured that the basement foundation bottom plate is stable in anti-floating water level, capable of discharging water without making sand flow, and reliable in water stopping.