Detachable fabricated building ladder step structure

The utility model discloses a detachable assembly type building ladder step structure which comprises a Z-shaped vertical plate, a ladder step top plate is hinged to the top of one side of the Z-shaped vertical plate, a ladder step bottom plate is hinged to the bottom of the other side of the Z-shaped vertical plate, and U-shaped pieces are connected to the front faces and the back faces of the top and the bottom of the Z-shaped vertical plate in an inserted mode. Fixing inserting grooves are formed in the front faces and the back faces of the ladder step top plates and the ladder step bottom plates correspondingly, one sides of the U-shaped pieces are inserted into the fixing inserting grooves, sleeve rod storage grooves are formed in the bottoms of one sides of the ladder step top plates, supporting sleeve rods are fixedly connected to the inner walls of one sides of the sleeve rod storage grooves, and supporting sleeves are inserted into the outer portions of the supporting sleeve rods; the top of one side