The invention discloses a backup protection system for card breakage of circuit, include a card break protection unit, A card-breaking protection unit comprises two chicken heart cards, Two shackles,Two eccentric pads, two pressing plates and two wedge-shaped gaskets, a chicken heart clamp and a shackle are connected, a shackle and an eccentric pressing block are rotatably connected, two eccentric pressing blocks are respectively located on both sides of the conductor and are rotatably connected to the pressing plate, wedge-shaped gaskets are respectively inserted between the conductor and each eccentric pressing block, and the eccentric pressing block presses the conductor by squeezing the wedge-shaped gasket; The conductor located on the inner side of the tensile card is provided with abroken card protection unit, and two chicken heart cards are connected by a steel strand; The conductors on both sides of the connecting pipe clip are respectively provided with a broken card protection unit, and a chicken core card of the broken card protection unit is connected with a chicken core card of the other broken card protection unit through a stranded wire. The back-up protection system forcard breakage of circuit can effectively eliminate the problem of line breakage of tensile cards and loss of connection after splicing of the pipe cards.