Annular assembly line

The invention discloses an annular assembly line comprising a straight rail. Bends of the straight rail are in transitional connection through a horizontal bending rail, the straight rail and the horizontal bending rail form a closed annular assembly line body frame, a tabletop is arranged above the annular assembly line body frame, a drive chain is slidingly arranged above the tabletop and is driven by a driving device, and cables are conveyed to at least tow operation platforms on the annular assembly line body frame by the drive chain. With the annular assembly line, assembly line technique is optimized, a closed path is formed, working efficiency is improved to the utmost, and economic benefit and market competitiveness of the company are greatly increased.