The invention relates to a clock spring capable of preventing fold-back and disorder of multiple cables. According to the clock spring, the structure stability is good, fold-back and disorder of the cables are prevented, and bonding of the flat cables does not excessively rely on using of lubricating oil. The clock spring comprises an inner ring, an upper cover, flexible idler wheels, the flat cables, a retainer and a planetary gear; the flexible idler wheels comprise center parts made of hard materials and peripheral parts made of flexible materials; the diameter of each flexible idler wheelis greater than the radial distance between the inner ring and the upper cover; the flexible idler wheels are mounted on the retainer or a center shaft of the planetary gear; one ends of the flat cables extend out of the inner ring and are wound around the inner ring, and then reversely wound back into the upper cover in a U-shaped mode; the planetary gear is mounted between the inner ring and gear teeth arranged on the upper cover; and connecting shafts are arranged on the upper side and the lower side of the retainer correspondingly, the connecting shaft on the lower side penetrates into acenter hole of the planetary gear, and the connecting shaft on the upper side penetrates into center holes of the flexible idler wheels.