Outer wall tongue-and-groove for preventing window from water seepage

The invention discloses an outer wall tongue-and-groove for preventing a window from water seepage and belongs to the technical field of outer window construction of civil engineering. The front structure of the outer wall tongue-and-groove is a rectangular frame arranged at an opening of an outer window; the section structure of the outer wall tongue-and-groove is in a ladder shape with the innerpart higher than the outer part, and an indoor part of the ladder shape is higher than an outdoor part of the ladder shape by 13mm-17mm. The construction process of the outer wall tongue-and-groove for preventing the window from water seepage includes the steps of main outer wall reinforcement binding, main outer wall formwork supporting, concrete pouring, auxiliary frame installation, JS waterproof construction, outer wall insulation construction and window frame installation. The outer wall tongue-and-groove for preventing the window from water seepage has the advantages that the probability of occurrence of window