The utility model provides a steel tube joint which is used for connecting steel tubes in a power transmission line steel tube tower. The steel tube joint comprises a main tube and a branch tube, and the axis of the branch tube is intersected with that of the main tube. The steel tube joint is characterized in that a base plate is arranged between the main tube and the branch tube, is provided with a laminated structure and comprises an upper base plate and a lower base plate, the lower base plate is connected with the main tube, the upper base plate is provided with a hole, and the branch tube penetrates the hole of the upper base plate and is connected with the lower base plate. Compared with the prior art, the steel tube joint has the advantages that structural arrangement is more reasonable, the shortcomings of a traditional tubular joint are overcome, welding conditions of welding seams are improved, and the bearing capacity and the stress state of the joint are remarkably improved.