The invention relates to the technical field of pressure vessels of water treatment devices, in particular to a novel pressure vessel. The novel pressure vessel comprises an inner container layer and a surface reinforcing layer, and the surface reinforcing layer is arranged outside the inner container layer. Connecting structures are arranged on the inner container layer, and the inner container layer and the connecting structures are integrally formed through rotational molding. According to the novel pressure vessel, through the integrally-formed inner container layer and connecting structures, production processes are simplified, manufacturability of the end faces of the connecting structures is improved, the overall performance and pressure-bearing performance of the pressure vessel are improved, utilization safety is guaranteed, and meanwhile, the aesthetic effect of the appearance is improved. Through the integrally-formed inner container layer and connecting structures, airtightness of the inner container layer is improved. The novel pressure vessel is compact in size, so that space is saved.