The utility model provides a clearance instrument for cement rotary kiln combustor, it includes steel pipe (1), drill rod (2), high temperature resistant filler (3), thermal -insulated lag (4) and a set of screw (5), the tail end symmetry of steel pipe (1) is opened there are two sets of screw holes, drill rod (2) welding is at the front end of steel pipe (1), high temperature resistant filler (3) are located steel pipe (1), thermal -insulated lag (4) are one end open -ended drums, and it has the mounting screw hole that corresponds with steel pipe (1) to open on thermal -insulated lag (4) lateral wall, thermal -insulated lag (4) suit is at the tail end of steel pipe (1), and through a set of screw (5) fastening, the utility model discloses the advantage is: cleaning efficiency is high, long service life, and use cost is low, simple to operate.