The utility model discloses a pre-stressed steel grid supporting broken line on the large span peripheral supporter. The utility model comprises a steel grid (1) and a pre-stressed steel wire rope (2). The connection of the steel grid (1) is made from square and four-angles wimbles. A steering device (3) is arranged on a slope rope part in the steel grid (1) and a driving device (4)is arranged on last quarter node of the middle of the steel grid (1). Both ends of the pre-stressed steel wire rope (2) are respectively fixed on two bracket node (11) of the steel grid (1) after the pre-stressed steel wire rope (2) goes through the driving device (4) and the steering device (3); the utility model has advantages of convenient construction, obvious pre-stress effect, good withstand ability, reasonable room in building without any remained space and low cost. The total price for the construction can be decreased by twenty to twenty- five per cent. .