Universal stair mold

The utility model discloses a universal stair mold which comprises a bottom plate, a second bottom mold, a supporting mechanism and a lower end mold, and the upper right end of the bottom plate is fixedly connected with a first bottom mold; the right end of the second bottom die is rotationally connected to the left end of the first bottom die, the left end of the second bottom die is rotationally connected to the right end of the third bottom die, and the adjusting mechanism is arranged at the lower end of the third bottom die. The supporting mechanisms are arranged at the upper end of the first bottom die and the upper end of the third bottom die correspondingly. Each supporting mechanism comprises a supporting plate, a limiting hole, a limiting rod and a spring. And the lower end mold is connected to the right side supporting plate in a nested mode, a first stepping face mold plate is installed at the left end of the lower end mold, and the left upper end of the first stepping face mold plate and the left