The utility model provides a self-rotating transmission line, which comprises an annular chain, wherein the annular chain is supported by an upper support rail and a lower support rail; a driving chain wheel and a driven chain wheel are arranged at the upper end of the inner side of the annular chain; and a tensioning chain wheel is arranged at the lower end of the inner side of the annular chain. The self-rotating transmission line is characterized in that: the chain is formed by connecting roller chain links, wherein each roller chain link comprises a roller, a chain shaft is arranged at a central shaft of each roller in a penetrating way, and the chain shafts of the adjacent roller chain links are connected through a chain plate. Compared with the original conveying chain, the improved chain ensures that coatings are uniformly distributed on the inner wall and the outer wall of an oil pipe in the peripheral direction because sliding is adopted instead of rolling.