Hole forming device

The invention provides a hole forming device. The hole forming device comprises a fixed seat, a structural part and a moving assembly. The fixed seat is provided with a plurality of guide parts; the guide parts are annularly distributed, and the extending direction of the axis of the ring is defined to be parallel to the first direction. And each guide part is provided with a guide surface intersected with the first direction. The number of the structural parts is multiple. Each structural part is movably arranged on one guide part. The structure has a moving portion and a molding portion. The moving part and the forming part are located at the two opposite ends of the structural part in the direction perpendicular to the first direction respectively. And each guide surface is configured to guide the moving part of the corresponding structural member to move. And each forming part is configured to be arranged towards the material and enable the material to form a construction hole. The moving assembly is conf