Will the wall of high-rise residential buildings collapse if the water seepage is not treated?

Water seepage will not cause the building to collapse, but it will make the latex paint on the indoor wall peeling off. Your situation should be that the sealing of the outside of the window is not done well, or the drip tank at the lower mouth of the window is blocked, so the rainwater can't flow out naturally at the lower mouth of the window and seep into the wall below from the joint, or there may be cracks in the outer wall at the window.

I suggest you check with the decorator and ask them to help you see what's wrong. If the sealing of the window is not done well, it can be treated with glass glue; If there is a crack in the external wall, it is necessary to plug the crack first, and then paint it with external wall paint, so that the problem is solved.