Penetrating preformed hole structure of drainage pipe on hollow cantilever plate

The utility model discloses a penetrating preformed hole structure of a drainage pipe on a hollow cantilever plate. The penetrating preformed hole structure solves the problem of how to reserve a rainwater penetrating hole in an accurate position in a hollow closed bay window cantilever plate. An upper pre-embedded PVC sleeve (6) is arranged in the upper protection layer pouring formwork (3) and fixedly connected with the upper protection layer middle reinforcing mesh (2), and a lower pre-embedded PVC sleeve (7) is arranged in the lower protection layer pouring formwork (5) and fixedly connected with the lower protection layer middle reinforcing mesh (4). An extruded sheet (8) is arranged between the upper protection layer pouring template (3) and the lower protection layer pouring template (5), a drainage pipe penetrating through hole (9) is formed in the extruded sheet (8) in the later period, and the upper pre-embedded PVC sleeve (6), the drainage pipe penetrating through hole and the lower pre-embedded PV