Safety check door bottom fixing device

The utility model provides a security door bottom fixing device, and belongs to the technical field of security doors. The security check door bottom fixing device comprises a security check door body, limiting mechanisms capable of horizontally stretching and retracting front and back are attached to the left side wall and the right side wall of the security check door body correspondingly, first box bodies are rotationally connected to the front side wall and the rear side wall of each limiting mechanism correspondingly, and the two first box bodies are clamped to the front side wall and the rear side wall of the security check door body correspondingly; and locking pieces are fixedly mounted at the tops of the clamping plates. The two limiting mechanisms are arranged and make contact with the left side and the right side of the security check door body, meanwhile, the front ends and the rear ends of the limiting mechanisms are rotationally connected with the first box bodies, the two first box bodies can b