The application provides a hollow double-layer plate, which comprises a connecting frame, an upper layer plate and a lower layer plate. The connecting frame is formed by connecting a plurality of frames with an arch-shaped cross section. Each frame has an upper slot and a lower slot which are spaced apart and have openings facing inwards, and an outer recess between the upper slot and the lower slot and having an opening facing outwards. The outer edge of the upper layer plate is inserted into the upper slot. The lower layer plate is spaced apart from the upper layer plate, and the outer edge of the lower layer plate is inserted into the lower slot. The upper layer plate and the lower layer plate are assembled by using the frames with an arch-shaped cross section, so that a hollow double-layer plate structure is formed, and the
assembly is simple. The hollow structure of the double-layer plate has a good heat preservation and energy saving effect. Meanwhile, the frame with an arch-shaped cross section has a simple structure, high strength and low cost. The hollow layer between the upper layer plate and the lower layer plate does not need a whole layer of reinforcing support structure for support, and is suitable for a plate which needs to transmit light.