Cooling device for hydraulic hammer

The utility model relates to a cooling device for a hydraulic hammer. The cooling device comprises a cylinder (1), a piston rod (2) is movably connected into the cylinder (1) in a matched mode, a drill rod (5) is connected to the front end of the piston rod (2) in a matched mode, and the cylinder (1) is connected with a hydraulic system (7) through a set of oil pipes (8). The cooling device is characterized in that a set of communicated pipelines (6) are arranged in the cylinder (1), a water inlet (6a) and a water outlet (6b) of the pipelines (6) are located on the two sides of the cylinder (1) respectively and connected through a water pipe (11), and a water pump (8) and a water tank (9) are arranged on the water pipe (11). The cooling device has the advantages that structure changing of an existing breaking hammer is small, the structure is simple, cost is low, cavitation and noise generated in work of the hydraulic hammer are lowered, the service life of the hydraulic hammer is prolonged, and the hydraulic