The invention provides a multi-class energy combined supply system. The multi-class energy combined supply system comprises a natural gas triple-supply part, a seawater energy part, a water storage part, a gas boiler part, a water supplementing part, a transformer distribution part, a monitoring control part and a user end part. The system combines the natural gas triple supply technology, the seawater source heat pump technology, the water energy storage technology and the gas boiler technology, the embedded intelligent system is orderly deployed, and the technology, the control and the management means are adopted, so that a cold and hot electric triple supply in the area is achieved, a safe and stable energy supply guarantee is provided for the energy supply area, and meanwhile, the problems of single energy production, single energy supply and transportation, and energy low efficiency utilization are synchronously solved, and intelligent collaboration and amplification of various energy sources is achieved. The system not only has the advantages of a conventional natural gas distributed energy system, but also has the advantages of renewable resources and other energy-saving and emission-reducing technologies, and well realizing the gradient utilization of energy sources.