Levered protective window for use in building construction

The invention discloses a levered protective window for use in building construction, comprising an outer frame which is rectangular. The center of the outer frame is provided with a bottom plate; tubes are disposed between the outer frame and the bottom plate; a telescopic bar is disposed in each tube; the outer end of each telescopic bar is a reducing segment; the center of the bottom plate is provided with a cam; when the cam rotates, blades can push out the telescopic bars; two side walls of each tube are provided with through slots; left and right fixing bars extending out of the through slots are fixedly connected to each telescopic bar; a first hinging block and a second hinging block are arranged on two sides of each tube; a first lever is hinged to each first hinging block; a second lever is hinged to each second hinging block; a telescopic foot is arranged outside the other end of each second lever. The levered protective window has the advantages that by rotating the cam, the window can be firmly mounted in a window hole to allow burglary prevention, mounting is facilitated, waste of raw materials is avoided, no nail hole is left, and the window is highly practical.