The utility model relates to a track used for automatically welding a T-shaped joint of a conduit rack, which is used for welding the conduit rack of an ocean platform. An annular guide rail consists of two opposite semi-annular guide rails; two hinges are fixed on the outer walls of one opposite ends of the two semi-annular guide rails, and the two hinges are respectively positioned at both sides of a gear ring; the middle part of the outer wall of the annular guide rail is provided with the gear ring; both ends of the inner side of the annular guide rail are conical surfaces; two groups of locking mechanisms are fixed on the inner walls of the other opposite ends of the two semi-annular guide rails; and four groups of support regulation seats are uniformly distributed and fixed on the inner wall of the annular guide rail. The utility model has the advantages that the T-shaped joint of the conduit rack is provided with an automatic welding track in automatic welding, an automatic welding head walks stably on the track, and the all-position automatic welding of the T-shaped joint of the conduit rack is realized. In addition, the track has the characteristics of light structure and the like, is easy to open and close and quick to regulate, and can meet the operation requirement of the automatic welding head of the T-shaped joint of the conduit rack.