The invention provides a bus tube and a joint thereof. The bus tube comprises a tube body which extends from left to right, wherein the left end and the right end of the tube body are connected with a cast tubular joint respectively; the tubular joint extends from left to right; one end of the tubular joint is integrally cast with a connecting flange which is used for connecting an insulation spacer; the other end of the tubular joint is used for being connected with the tube body; and the side wall of the tubular joint is also integrally cast with a connecting pipe which is used for charging, deflating or mounting a molecular sieve. When the bus tube provided by the invention is manufactured, only the tubular joint needs to be produced and the tube body with the required length is cut out; the tubular joint can be greatly produced on a large scale through a casting mold; a standard pipe fitting can be cut out from the tube body; the manufacture and assembly processes are greatly reduced; the production efficiency is improved; and the production cost is reduced.