Foundation pit support structure anti-seepage and anti-leakage post-embedding device and mounting method thereof

The invention relates to an anti-seepage and anti-leakage pre-embedding device of a foundation pit support structure and an installation method of the anti-seepage and anti-leakage pre-embedding device of the foundation pit support structure, and the installation method comprises the steps that before an internal structure is constructed, a drainage hose is arranged at a seepage area of the foundation pit support structure; when internal structural steel bars are bound, a hollow hard pipe is arranged, and the drainage hose is sleeved with the hollow hard pipe; when the internal structure is poured, the hollow hard pipe and the internal structure are poured together; and after concrete curing of the internal structure is finished, a plugging material is injected into the leakage area and the drainage hose in a pressing mode through the drainage hose, then the plugging material is injected between the drainage hose and the hollow hard pipe in a pressing mode through the hollow hard pipe, and a plugging piece is