Rotary joint for fluid loading and unloading arm

The utility model relates to the technical field of adapters, and discloses a rotary joint for a fluid loading and unloading arm, which comprises a pipe arm and an access pipe, a connecting ring a is fixedly mounted at the left end of the pipe arm, a connecting ring b is fixedly mounted at the right end of the access pipe, a pressure circular plate is movably sleeved on the pipe arm, and a rotary pipe is fixedly mounted on the left side of the pressure circular plate. A circular block is fixedly connected to the connecting-in pipe in a sleeving mode, threads are formed in the outer side wall of the circular block, threads are formed in the inner side wall of the connecting-in pipe, the pipe arm and the connecting-in pipe are aligned and attached, then the rotating pipe is rotated to be connected with the circular block in a meshed mode, and therefore the spring can be driven to move leftwards, and the pressure applying plate can be driven to move leftwards; when the pipe arm is connected with the connecting p