Prefabricated house bay window plate assembly

The utility model provides a prefabricated house bay window plate assembly which solves the problems that a construction method for building a bay window plate body on site is complex, a formwork is difficult to erect, and the construction period is prolonged. The device comprises a bottom plate, a left vertical plate is fixedly arranged on the left side of the bottom plate, a right vertical plate is fixedly arranged on the right side of the bottom plate, the top face of the left vertical plate is flush with the top face of the right vertical plate, and a gap exists between the left vertical plate and the right vertical plate; side plates for sealing the gaps are arranged on the front sides and the rear sides of the left vertical plate and the right vertical plate; the top surfaces of the side plates are flush with the top surface of the left vertical plate; a hollow groove is formed in the middle defined by the left vertical plate, the right vertical plate and the two side plates. The tops of the left vertic