Drilling tool for casing assembly

The utility model discloses a drilling tool for a casing assembly, which comprises a base, a first positioning piece, a second positioning piece, a positioning sliding block, a casing assembly fixed piece, a drilling device and a fixed adjusting device, wherein the first positioning piece and the second positioning piece are respectively groove-shaped and are fixed on the base in parallel; and a spacing space is arranged between the first positioning piece and the second positioning piece. The casing assembly fixed piece is positioned on one side of the first positioning piece; and the drilling device is positioned on the other side of the first positioning piece. The drilling tool can be conveniently used for drilling the surface of the casing assembly.