The utility model discloses a water -cooled rock drill, including the aircraft nose, the aircraft nose endotheca is equipped with and rotates the cover, has water cavity d and cavity c between the outer wall of rotation cover and the inner wall of aircraft nose, through lead to the cooling that the aircraft nose can be realized to the cooling water in water cavity d and cavity c. The above technical scheme is adopted in the utility model, have following advantage: can reduce the temperature on aircraft nose surface by a wide margin, can make the temperature of aircraft nose surface keep 28 32 the injury to the operator has effectively been avoided in the operation to DEG C left and right sides, the heat expansion has been eliminated to the aircraft nose and the influence of rotating the inner room fit clearance, the vibration of the rock drill that has reduced to arouse because of the clearance increase, the wearing and tearing of bit shank sleeve hexagonal hole and drill rod afterbody can be effectively reduced, life has been improved.