High-strength seal

The utility model discloses a high-strength seal. The high-strength seal comprises a U-shaped lock catch, a locking piece and an insurance bar, wherein the U-shaped lock catch comprises an upper side edge and a lower side edge, and at least two inserted holes are arranged on the upper side edge; the locking piece comprises an upper inserted groove and a lower inserted groove which are respectively matched with the upper side edge and the lower side edge, meanwhile a through hole vertically intersectant with both the upper inserted groove and the lower inserted groove is formed in the locking piece, a step is arranged on the upper portion of the inner side of the through hole, an end cover is arranged on the lower port portion of the through hole, a lock cylinder is arranged in the through hole, an inner through hole is formed in the lock cylinder, and a C-shaped snap spring is clamped in the inner through hole; and the insurance bar comprises a lock pin and a lock body which are connected through a steel wire