Informatization construction method for long, large and deep foundation pit close to subway tunnel

The invention provides an informatization construction method for a long, large and deep foundation pit adjacent to a subway tunnel, which comprises the following steps: adopting bin division excavation, performing bin division excavation on the foundation pit by combining a supporting wall with a separating wall, excavating the foundation pit to a designed elevation under the action of an inner support and angle support supporting structure, and enabling the supporting wall and the separating wall to be a wall body formed by combining a secant pile with a top beam and a waist beam; after the previous foundation pit is excavated, deformation monitoring is conducted on the excavated foundation pit; on the basis of different control points, on-site construction monitoring data of the top horizontal displacement, the deep soil displacement, the ground surface settlement and the deep horizontal displacement of the enclosure structure are measured respectively; in the whole excavation process of the foundation pit