The invention provides a tongue-and-groove template of a window aperture. The template comprises a first template unit and a second template unit which are firmly connected, wherein the first template unit comprises a C-groove sectional material as well as two first sealing plates located at two ends of the C-grove sectional material; and the second template unit comprises an angular aluminum sectional material as well as two second sealing plates located at two ends of the angular aluminum sectional material. In comparison with the prior art, the template provided by the invention has the beneficial effects that a non-filling mode is adopted; existing aluminum dies are welded, combined and shaped; construction and shaping types are abundant; diversified market demands can be satisfied; manufacture processes are simple; shaping faces are smooth and free of locking and connecting marks; and shaping effects are good.