Improved rotary joint of roller slag cooler

The utility model discloses an improved rotary joint of a roller slag cooler, and relates to the technical field of rotary joints of boiler slag coolers. A cylinder body of the rotating joint is a hollow cavity, one end is communicated with the roller slag cooler through a first flange joint, the other end is communicated with the water inlet metal hose through a second flange joint, and the top is communicated with the water return pipe through a third flange joint; a built-in bearing seat is arranged in the end, close to the second flange connector, of the barrel, and the core pipe penetrates through the built-in bearing seat and penetrates through the barrel. A packing and a packing gland are sequentially arranged on one side of the built-in bearing seat, a first spacer ring, a second spacer ring and a lock nut are sequentially arranged on the other side of the built-in bearing seat, and the lock nut is connected with the core tube through threads. A built-in bearing is replaced bythe first spacer ring and