The invention discloses a process system for realizing supply of cold water, warm water and hot water by using radiant heat of a cylinder of a rotary kiln. The key points are that: three different systems which can supply the cold water, the warm water and the hot water are formed by devices or mechanisms such as a radiant heat recovery device, a heat storage water tank, a heating mechanism, a refrigerating mechanism, a domestic hot water mechanism and the like. Through the process system, the radiant waste heat of the cylinder of the rotary kiln is fully utilized throughout the year, a heating medium water source for refrigeration and heating and domestic hot water are provided for people, and the organic combination of refrigeration, heating and the domestic hot water is also realized through the radiant waste heat of the cylinder of the rotary kiln. The system runs conveniently and reliably, can be intelligently controlled, saves energy and is environmentally-friendly.