Emergency water guide construction method for large sewage plant

The invention discloses an emergency water guide construction method for a large sewage plant, which belongs to the technical field of water guide construction and comprises the following steps: S1, designing a construction scheme according to the flow and actual condition of water guide equipment; s2, after water is cut off in a factory area and tail water is reserved for 2 min, a well mouth cover plate at a metering channel cover plate is opened, a customized steel plate is vertically placed at one end of a well mouth, and square timber is vertically placed at the other end of the well mouth; a plurality of drainage holes are formed in the customized steel plate; s3, according to the construction scheme, a plurality of guide water pumps are vertically placed in the well mouth and connected with the ground through cables, and the situation that water flow is large and washes away the guide water pumps is prevented; the output end of the water guide pump is connected with a nylon water hose; one end, far away