Building water supply and drainage casing pipe pre-burying tool

The utility model belongs to the technical field of building water supply and drainage, and relates to a building water supply and drainage sleeve embedding tool which comprises an inner fixing plate, an upper cover plate and a connecting piece, the inner fixing plate is installed inside a sleeve, the outer edge of the inner fixing plate makes contact with the inner wall of the sleeve, the upper cover plate is installed on the top of the sleeve, and the connecting piece is installed on the upper cover plate. The connecting piece is used for connecting the inner fixing plate and the upper cover plate. In the utility model, the inner fixing plate is lined inside the sleeve, the top of the sleeve is covered with the cover plate, and the sleeve is fixed through the connecting piece, so that the sleeve is fixed in the horizontal direction and the vertical direction, an inner fixing method is adopted, concrete is not poured into the inner fixing plate, no nail or screw is exposed at the bottom of the plate after fo