Prefabricated stair and stair and floor slab connecting structure

The utility model provides a prefabricated stair and a connecting structure of the stair and a floor slab. The prefabricated stairway and the stairway and floor slab connecting structure comprise a stairway; the floor slabs abut against the two ends of the stairs correspondingly; the adjusting structure is fixed to the top face of the floor slab, and the adjusting structure comprises a first bottom plate, an adjusting box, a first rotating handle, a second rotating handle, a connecting plate, a first gear, a first adjusting strip, a first spring, a second adjusting strip and a second spring; the fixing structures are fixed to the top faces of the two ends of the stairs, and each fixing structure comprises a second bottom plate, a fixing box, a third rotating handle, a connecting rod, a nut and a second gear; and the clamping structure is mounted in the fixed box. The prefabricated stair and the stair and floor slab connecting structure have the advantage that fine adjustment can be conducted conveniently and