Combined tube tire

The utility model discloses a combined tube tire which comprises a tube tire body, the tube tire body is a tube tire formed by combining a long tube tire and a short tube tire, the long tube tire comprises a tube body, one end of the tube body is a conical end, the conical surface of the conical end is provided with an external thread, the other end of the tube body is provided with a conical groove matched with the conical end, and the short tube tire is arranged in the conical groove. An internal thread matched with the external thread is arranged on the conical surface of the conical groove; the structure of the short tube tires is consistent with that of the long tube tires, the number of the short tube tires is at least two, the number of the long tube tires is at least one, the two ends of the long tube tires are in threaded connection with the short tube tires, and when the outer side surfaces of the short tube tires are provided with cutting marks, the short tube tires can be replaced. The two ends of