LNG (Liquefied Natural Gas) pipeline circulating cooling device

The utility model discloses an LNG (liquefied natural gas) pipeline circulating cooling device, which belongs to the technical field of LNG cooling equipment and comprises a supporting leg, a butt joint frame and a tail sealing frame are arranged on the upper portion of the supporting leg, the butt joint frame is matched with the tail sealing frame in a butt joint mode, the front portion of the butt joint frame is matched with the rear portion of the butt joint frame in a butt joint mode, and nuts are arranged outside the butt joint frame and the tail sealing frame. The butt-joint frames and the tail-sealing frame are fixed through nuts, heat exchange pipes are fixedly connected into the butt-joint frames and the tail-sealing frame, a connecting pipe is arranged between pipe openings of every two heat exchange pipes, the butt-joint frames are mutually spliced, finally, the tail-sealing frame is spliced at the tail, then the nuts are screwed on the butt-joint frames and the tail-sealing frame, and the butt-joi