Large-size tail pipe hanger and using method thereof

According to the large-size tail pipe hanger and the using method thereof, a bearing shoulder protruding out of the inner wall of a hanging short section is arranged on the inner wall of the hanging short section, a body is installed in the hanging short section through a bearing ring and the bearing shoulder, and the inner wall of the hanging short section and the outer wall of the bearing ring are connected through a limiting device. An opening lock ring is arranged between the hanging short section below the bearing ring and the body, a lock ring groove is formed in the outer wall of the body, and the outer wall of the body is connected with the opening lock ring through the lock ring groove. According to the invention, a single or even a plurality of casing pipes can be connected in series on a large-size casing pipe, so that the number of layers of one or more casing pipes is increased, and the operation difficulty and the operation risk of a high-temperature and high-pressure well and an ultra-deep well